remove random generated name hack

We no longer need the random id hack for generating Cloud Run resource
names as the provider now supports a autogenerate_revision_name flag
which allows Google to generate the appropriate resource name for us.

Closes #4

main.tf

@@ -16,16 +16,13 @@ resource "google_project_iam_member" "webapp_sql_client" {
 
 # A Cloud Run service which hosts the webapp
 
-resource "random_id" "webapp_revision_name" {
-  byte_length = 4
-  prefix      = "${var.name}-"
-}
-
 resource "google_cloud_run_service" "webapp" {
   name     = var.name
   location = var.cloud_run_region
   project  = var.project
 
+  autogenerate_revision_name = true
+
   template {
     metadata {
       annotations = {
@@ -45,9 +42,6 @@ resource "google_cloud_run_service" "webapp" {
         "run.googleapis.com/client-name"    = "placeholder"
         "run.googleapis.com/client-version" = "placeholder"
       }
-
-      # See the README for information on this.
-      name = random_id.webapp_revision_name.hex
     }
 
     spec {