- Add app-code volume to both nginx and app containers
- App container clones code once into shared volume
- Nginx container uses shared volume (read-only) and waits for code
- Update entrypoint.sh to handle storage-preserving git clone
- Fix nginx configuration to use app:9000 for PHP-FPM
This eliminates duplicate code cloning and ensures both containers
always use the same code version from the shared volume.
