Add attributes for gcs backend to specify an existing bucket in another project

[Reifier]

Current Terraform Version

Terraform v0.12.21
+ provider.google v3.16.0
+ provider.google-beta v3.9.0
+ provider.kubernetes v1.10.0
+ provider.random v2.2.1

Use-cases

Having provider creating project resources including the project itself, but being able to specify a bucket in existing project with directive independent of provider.

Attempted Solutions

Attempted to specify an existing bucket as a gcs backend

Proposal

See linked issue for more details.

References

hashicorp/terraform-provider-google#6117

[Reifier]

Another alternative I can see is creating an alias provider with another set of credentials and then passing the provider explicitly:

  backend "gcs" {
    provider = my_aliased_provider
  }

[ghost]

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