Adds comment for help troubleshooting issues with terraform tfstate (g…

…oogleforgames#3822)

* Adds comment to assist with troubleshooting issues with terraform tfstate

build/terraform/e2e/state-bucket/main.tf

@@ -16,6 +16,14 @@
 // Run:
 //  terraform apply -var project="<YOUR_GCP_ProjectID>"
 
+// If you are getting `Error: googleapi: Error 409: Your previous request to create the named bucket
+// succeeded and you already own it., conflict` this means that your local tfstate file has
+// divereged from the tfstate file in Google Cloud Storage (GCS). To use the GCS version of the
+// tfstate, delete your local .terraform and .tfstate files. You may need to run
+// `sudo chown -R yourusername .` to be able to delete them. Then navigate to this directory and run
+// `terraform init`. Pull in the tfstate file from gcloud with
+// `terraform import google_storage_bucket.default agones-images-e2e-infra-bucket-tfstate`.
+
 // # GCS bucket for holding the Terraform state of the e2e Terraform config.
 
 terraform {
@@ -40,4 +48,4 @@ resource "google_storage_bucket" "default" {
   versioning {
     enabled = true
   }
-}
+}