Prevent anonymous volume creation

ccp/modules/login-compose.yml

@@ -9,6 +9,8 @@ services:
       POSTGRES_USER: "keycloak"
       POSTGRES_PASSWORD: "${KEYCLOAK_DB_PASSWORD}" # Set in login-setup.sh
       POSTGRES_DB: "keycloak"
+    tmpfs:
+      - /var/lib/postgresql/data
 # Consider removing this comment once we have collected experience in production.
 #    volumes:
 #      - "bridgehead-login-db:/var/lib/postgresql/data"