Support conformance env lifecycle in GCP CI Cloud Build

Author: roger2hk

deployment/live/gcp/cloudbuild/README.md

@@ -22,13 +22,3 @@ Error: Error creating Trigger: googleapi: Error 400: Repository mapping does not
 
 This is a manual one-time step that needs to be followed to integrate GCP Cloud Build 
 and the GitHub repository.
-
-## Externally managed IAM
-
-In case your GCP organization manages the IAM externally, execute the following command before executing `terragrunt apply`.
-
-```sh
-export SKIP_IAM=true
-```
-
-Note that the `SKIP_IAM` value in Cloud Build is propagated to the conformance testing environment.

deployment/modules/gcp/conformance/variables.tf

@@ -27,8 +27,3 @@ variable "server_docker_image" {
   description = "The full image URL (path & tag) for the Docker image to deploy in Cloud Run"
   type        = string
 }
-
-variable "skip_iam" {
-  description = "Skip for GCP projects with externally managed IAM"
-  type        = bool
-}