deploy.sh was only running alembic upgrade on the old container when
migration files changed, but the migration files are baked into the
Docker image. Now it rebuilds the app image when migrations change.
- Track BASE_REBUILT flag to detect base image rebuilds
- Force app image rebuild when base image is rebuilt
- Prevents stale app images built with outdated base images
- Ensures consistent deployment when base dependencies change
- Add Dockerfile.base.local to deps hash to detect Docker configuration changes
- Ensures deployment rebuilds when nginx proxy settings are modified
- Prevents stale Docker images from being reused after config changes
