GCS backend credentials should allow content and not just path

[alwaysastudent]

Currently the GCS backed expects a relative path. But it would be desirable if we can pass the contents of the credentials JSON key as an argument over -backend-config= or we can interpolate a unique environment variable on the credentials attribute or retrofit another credentials attribute. Wish we can interpolate arbitrary environment variables.

Something like

data "terraform_remote_state" "remote1" {
  backend = "gcs"

  config {
    bucket      = "${bucket}"
    credentials = "$env(REMOTE1_CREDS)"
  }
}

data "terraform_remote_state" "remote2" {
  backend = "gcs"

  config {
    bucket      = "${bucket}"
    credentials = "$env(REMOTE2_CREDS)"
  }
}

[ghost]

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