Resolve CI changes not being ignored by terraform

Changes copied from working copy of IAR deployment.

Should be tested with a project that includes this module (IAR doesn't yet).

Closes #3 (closed)

main.tf

@@ -37,6 +37,13 @@ resource "google_cloud_run_service" "webapp" {
         # Cloud SQL instances to auto-magically make appear in the container as
         # Unix sockets.
         "run.googleapis.com/cloudsql-instances" = var.sql_instance_connection_name
+
+        # As mentioned at https://www.terraform.io/docs/configuration/resources.html#ignore_changes
+        # placeholders need to be created as the adding the key to the map is
+        # considered a change and not ignored by ignore_changes
+        "client.knative.dev/user-image"     = "placeholder"
+        "run.googleapis.com/client-name"    = "placeholder"
+        "run.googleapis.com/client-version" = "placeholder"
       }
 
       # See the README for information on this.
@@ -89,6 +96,9 @@ resource "google_cloud_run_service" "webapp" {
       # resource be updated.
       template[0].spec[0].containers[0].image,
 
+      # Also the name of the revision will change with each CI deployment
+      template[0].metadata[0].name,
+
       # Some common annotations which we don't care about.
       template[0].metadata[0].annotations["client.knative.dev/user-image"],
       template[0].metadata[0].annotations["run.googleapis.com/client-name"],