Add GCS backend specific env var for impersonation

[bharathkkb]

Terraform Version

N/A

Use Cases

Similar to #23656 and

terraform/internal/backend/remote-state/gcs/backend.go

Line 110 in 5fcf1e5

"GOOGLE_BACKEND_STORAGE_CUSTOM_ENDPOINT",

, provide a backend specific env var for impersonation to prevent reuse of TPG(B) impersonation env var.

Attempted Solutions

N/A

Proposal

Add support for GOOGLE_BACKEND_IMPERSONATE_SERVICE_ACCOUNT env var specifically for backend.

References

No response

[crw]

Thanks for this request!

[github-actions]

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