feat(coder): update Coder connection string

coder/resources/db/db.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: db.movetokube.com/v1alpha1
 kind: Postgres
 metadata:

coder/resources/db/user.yaml

@@ -7,4 +7,6 @@ spec:
   role: coder
   database: coder
   secretName: coder-db-credentials
-  privileges: OWNER
+  privileges: OWNER
+  secretTemplate:       # Output secrets can be customized using standard Go templates
+    PQ_URL: "postgresql://{{.Role}}:{{.Password}}@app-cluster-pooler-rw.postgres.svc:5432/{{.Database}}?sslmode=require&search_path=coder"