refactor: Removed AR variables

Author: spuerta10

terraform/environments/stg.tfvars

@@ -1,6 +1,4 @@
+# db_user, db_password, db_name & project_id come from the pipeline
 environment = "stg"
 region      = "us-central1"
-project_id  = "your-project-id"
-db_tier     = "db-f1-micro" 
-
-# db_user, db_password & db_name come from the pipeline
+db_tier     = "db-f1-micro" 

terraform/variables.tf

@@ -25,12 +25,6 @@ variable "environment" {
     type = string
 }
 
-# --- artifact registry vars ---
-
-variable "registry_id" {
-    type=string
-}
-
 # --- database vars ---
 
 variable "db_user" {