Docker: update dev overrides so that app starts

docker-compose.dev-override.yml

@@ -4,3 +4,8 @@ services:
     environment:
       - SPEJSTORE_ENV=dev
       - SPEJSTORE_ALLOWED_HOSTS=localhost,127.0.0.1
+      - SPEJSTORE_CLIENT_ID=inventory
+      - SPEJSTORE_DB_NAME=postgres
+      - SPEJSTORE_DB_PASSWORD=postgres
+      - SPEJSTORE_DB_USER=postgres
+      - SPEJSTORE_DB_HOST=db