Use unique bundle name for Cloud Function

When cloud-function module is used multiple times within project and
default `bundle_config.output_path` is used then all the instances try
to use filename and result is undefined without guarantee to converge to
desired state (i.e. multiple functions may share the same code).

modules/cloud-function/main.tf

@@ -267,8 +267,8 @@ resource "google_storage_bucket_object" "bundle" {
 data "archive_file" "bundle" {
   type             = "zip"
   source_dir       = var.bundle_config.source_dir
-  output_path      = var.bundle_config.output_path
-  output_file_mode = "0666"
+  output_path      = var.bundle_config.output_path != null ? var.bundle_config.output_path : "/tmp/bundle-${var.project_id}-${var.name}.zip"
+  output_file_mode = "0644"
   excludes         = var.bundle_config.excludes
 }
 

modules/cloud-function/variables.tf

@@ -38,7 +38,7 @@ variable "bundle_config" {
   description = "Cloud function source folder and generated zip bundle paths. Output path defaults to '/tmp/bundle.zip' if null."
   type = object({
     source_dir  = string
-    output_path = optional(string, "/tmp/bundle.zip")
+    output_path = optional(string)
     excludes    = optional(list(string))
   })
 }