Add description of client registration variables/properties

[federicaagostini]

In particular:

• IAM_CLIENT_REGISTRATION_ALLOW_FOR
• IAM_CLIENT_REGISTRATION_ENABLE
• IAM_DEFAULT_ACCESS_TOKEN_VALIDITY_SECONDS
• IAM_DEFAULT_DEVICE_CODE_VALIDITY_SECONDS
• IAM_DEFAULT_ID_TOKEN_VALIDITY_SECONDS
• IAM_DEFAULT_REFRESH_TOKEN_VALIDITY_SECONDS

[federicaagostini]

I've set this PR as draft since I don't know if we want to fix the already released but not advertized environment variables for AT, RT, ID token and device code lifetimes. In particular, @giacomini suggested to prefix all of them with IAM_, as all of the other iam: properties.

Also, let me know if we also want to create another page to show how to configure the client-registration with an application.yml file (e.g. copy-and-paste plus explain those properties).

[rmiccoli]

I've set this PR as draft since I don't know if we want to fix the already released but not advertized environment variables for AT, RT, ID token and device code lifetimes. In particular, @giacomini suggested to prefix all of them with IAM_, as all of the other iam: properties.

Also, let me know if we also want to create another page to show how to configure the client-registration with an application.yml file (e.g. copy-and-paste plus explain those properties).

I agree to rename those variables by adding the IAM prefix.
Then, I think it is ok to explain the variables there as all other configurations are also listed.

[federicaagostini]

I've set this PR as draft since I don't know if we want to fix the already released but not advertized environment variables for AT, RT, ID token and device code lifetimes. In particular, @giacomini suggested to prefix all of them with IAM_, as all of the other iam: properties.
Also, let me know if we also want to create another page to show how to configure the client-registration with an application.yml file (e.g. copy-and-paste plus explain those properties).

I agree to rename those variables by adding the IAM prefix.

This should be solved with indigo-iam/iam#807

Then, I think it is ok to explain the variables there as all other configurations are also listed.

[federicaagostini]

Then, I think it is ok to explain the variables there as all other configurations are also listed.

Done