Add GCP Stack creation Wizard (CLI)

docs/book/how-to/stack-deployment/register-a-cloud-stack.md

@@ -33,84 +33,149 @@ In order to register a remote stack over the CLI with the stack wizard,
 you can use the following command:
 
 ```shell
-zenml stack register <STACK_NAME> -p aws
+zenml stack register <STACK_NAME> -p {aws|gcp}
 ```
 
 To register the cloud stack, the first thing that the wizard needs is a service 
-connector. You can either use an existing connector by providing its ID 
-`-c <CONNECTOR_ID>` or the wizard will create one for you.
+connector. You can either use an existing connector by providing its ID or name 
+`-sc <SERVICE_CONNECTOR_ID_OR_NAME>` or the wizard will create one for you.
 
 Similar to the service connector, you can also use existing stack components.
-However, this is only possible if these component are already configured with 
+However, this is only possible if these components are already configured with 
 the same service connector that you provided through the parameter 
 described above.
 
 {% hint style="warning" %}
-Currently, the stack wizard only works on AWS. We are working on bringing 
-support to GCP and Azure as well. Stay in touch for further updates.
+Currently, the stack wizard only works on AWS and GCP. We are working on bringing 
+support to Azure as well. Stay in touch for further updates.
 {% endhint %}
 
-### AWS
+### Define Service Connector
+
+Below you will find cloud-specific selection options. Based on your selection, you will have to provide the required parameters listed 
+below. This will allow ZenML to create a Service Connector and 
+authenticate you to use your cloud resources.
+
+#### AWS
 
 If you select `aws` as your cloud provider, and you haven't selected a connector
 yet, you will be prompted to select an authentication method for your stack.
 
 {% code title="Example Command Output" %}
 ```
-                         Available authentication methods for aws                                      
-┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-┃ Choice ┃ Name                 ┃ Required                                       ┃
-┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-│ [0]    │ AWS Secret Key       │ aws_access_key_id  (AWS Access Key ID)         │
-│        │                      │ aws_secret_access_key  (AWS Secret Access Key) │
-│        │                      │ region  (AWS Region)                           │
-│        │                      │                                                │
-├────────┼──────────────────────┼────────────────────────────────────────────────┤
-│ [1]    │ AWS STS Token        │ aws_access_key_id  (AWS Access Key ID)         │
-│        │                      │ aws_secret_access_key  (AWS Secret Access Key) │
-│        │                      │ aws_session_token  (AWS Session Token)         │
-│        │                      │ region  (AWS Region)                           │
-│        │                      │                                                │
-├────────┼──────────────────────┼────────────────────────────────────────────────┤
-│ [2]    │ AWS IAM Role         │ aws_access_key_id  (AWS Access Key ID)         │
-│        │                      │ aws_secret_access_key  (AWS Secret Access Key) │
-│        │                      │ region  (AWS Region)                           │
-│        │                      │ role_arn  (AWS IAM Role ARN)                   │
-│        │                      │                                                │
-├────────┼──────────────────────┼────────────────────────────────────────────────┤
-│ [3]    │ AWS Session Token    │ aws_access_key_id  (AWS Access Key ID)         │
-│        │                      │ aws_secret_access_key  (AWS Secret Access Key) │
-│        │                      │ region  (AWS Region)                           │
-│        │                      │                                                │
-├────────┼──────────────────────┼────────────────────────────────────────────────┤
-│ [4]    │ AWS Federation Token │ aws_access_key_id  (AWS Access Key ID)         │
-│        │                      │ aws_secret_access_key  (AWS Secret Access Key) │
-│        │                      │ region  (AWS Region)                           │
-│        │                      │                                                │
-└────────┴──────────────────────┴────────────────────────────────────────────────┘
+                  Available authentication methods for aws                   
+┏━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃ Choice  ┃ Name                           ┃ Required                       ┃
+┡━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+│ [0]     │ AWS Secret Key                 │ aws_access_key_id  (AWS Access │
+│         │                                │ Key ID)                        │
+│         │                                │ aws_secret_access_key  (AWS    │
+│         │                                │ Secret Access Key)             │
+│         │                                │ region  (AWS Region)           │
+│         │                                │                                │
+├─────────┼────────────────────────────────┼────────────────────────────────┤
+│ [1]     │ AWS STS Token                  │ aws_access_key_id  (AWS Access │
+│         │                                │ Key ID)                        │
+│         │                                │ aws_secret_access_key  (AWS    │
+│         │                                │ Secret Access Key)             │
+│         │                                │ aws_session_token  (AWS        │
+│         │                                │ Session Token)                 │
+│         │                                │ region  (AWS Region)           │
+│         │                                │                                │
+├─────────┼────────────────────────────────┼────────────────────────────────┤
+│ [2]     │ AWS IAM Role                   │ aws_access_key_id  (AWS Access │
+│         │                                │ Key ID)                        │
+│         │                                │ aws_secret_access_key  (AWS    │
+│         │                                │ Secret Access Key)             │
+│         │                                │ region  (AWS Region)           │
+│         │                                │ role_arn  (AWS IAM Role ARN)   │
+│         │                                │                                │
+├─────────┼────────────────────────────────┼────────────────────────────────┤
+│ [3]     │ AWS Session Token              │ aws_access_key_id  (AWS Access │
+│         │                                │ Key ID)                        │
+│         │                                │ aws_secret_access_key  (AWS    │
+│         │                                │ Secret Access Key)             │
+│         │                                │ region  (AWS Region)           │
+│         │                                │                                │
+├─────────┼────────────────────────────────┼────────────────────────────────┤
+│ [4]     │ AWS Federation Token           │ aws_access_key_id  (AWS Access │
+│         │                                │ Key ID)                        │
+│         │                                │ aws_secret_access_key  (AWS    │
+│         │                                │ Secret Access Key)             │
+│         │                                │ region  (AWS Region)           │
+│         │                                │                                │
+└─────────┴────────────────────────────────┴────────────────────────────────┘
 ```
 {% endcode %}
 
-Based on your selection, you will have to provide the required parameters listed 
-above. This will allow ZenML to create a Service Connector and 
-authenticate you to use your cloud resources.
+#### GCP
+
+If you select `gcp` as your cloud provider, and you haven't selected a connector
+yet, you will be prompted to select an authentication method for your stack.
+
+{% code title="Example Command Output" %}
+```
+                  Available authentication methods for gcp                   
+┏━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃ Choice  ┃ Name                           ┃ Required                       ┃
+┡━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+│ [0]     │ GCP User Account               │ user_account_json  (GCP User   │
+│         │                                │ Account Credentials JSON       │
+│         │                                │ optionally base64 encoded.)    │
+│         │                                │ project_id  (GCP Project ID    │
+│         │                                │ where the target resource is   │
+│         │                                │ located.)                      │
+│         │                                │                                │
+├─────────┼────────────────────────────────┼────────────────────────────────┤
+│ [1]     │ GCP Service Account            │ service_account_json  (GCP     │
+│         │                                │ Service Account Key JSON       │
+│         │                                │ optionally base64 encoded.)    │
+│         │                                │                                │
+├─────────┼────────────────────────────────┼────────────────────────────────┤
+│ [2]     │ GCP External Account           │ external_account_json  (GCP    │
+│         │                                │ External Account JSON          │
+│         │                                │ optionally base64 encoded.)    │
+│         │                                │ project_id  (GCP Project ID    │
+│         │                                │ where the target resource is   │
+│         │                                │ located.)                      │
+│         │                                │                                │
+├─────────┼────────────────────────────────┼────────────────────────────────┤
+│ [3]     │ GCP Oauth 2.0 Token            │ token  (GCP OAuth 2.0 Token)   │
+│         │                                │ project_id  (GCP Project ID    │
+│         │                                │ where the target resource is   │
+│         │                                │ located.)                      │
+│         │                                │                                │
+├─────────┼────────────────────────────────┼────────────────────────────────┤
+│ [4]     │ GCP Service Account            │ service_account_json  (GCP     │
+│         │ Impersonation                  │ Service Account Key JSON       │
+│         │                                │ optionally base64 encoded.)    │
+│         │                                │ target_principal  (GCP Service │
+│         │                                │ Account Email to impersonate)  │
+│         │                                │                                │
+└─────────┴────────────────────────────────┴────────────────────────────────┘
+```
+{% endcode %}
+
+### Defining cloud components
 
 Next, for each missing component, the available resources will be listed to 
 you as follows:
 
 {% code title="Example Command Output for Artifact Stores" %}
 ```
-                       Available AWS storages                                                           
-┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-┃ Choice ┃ Storage                                                     ┃
-┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-│ [0]    │ s3://**************                                         │
-├────────┼─────────────────────────────────────────────────────────────┤
-│ [1]    │ s3://**************                                         │
-└────────┴─────────────────────────────────────────────────────────────┘
+                           Available GCP storages                            
+┏━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃ Choice        ┃ Storage                                                   ┃
+┡━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+│ [0]           │ gs://***************************                          │
+├───────────────┼───────────────────────────────────────────────────────────┤
+│ [1]           │ gs://***************************                          │
+└───────────────┴───────────────────────────────────────────────────────────┘
 ```
 {% endcode %}
 
+### Final steps
+
 Based on your selection, ZenML will create the stack component and ultimately 
 register the stack for you.