Rebuild deploy process on the project template

- Dockerfile: deps → builder → pb-downloader → runner stages, cross-arch
  (BUILDPLATFORM node stages, TARGETARCH PocketBase binary), Debian slim
  runner, VOLUME /app/pb_data, dual healthcheck, docker-entrypoint.sh
- docker-entrypoint.sh: bash supervisor replacing scripts/run-all.mjs
- Makefile: build-production (multi-arch push from git remote),
  build-check, build-check-local
- deploy.sh [tag]: make build-production then ansible-playbook with tag
- drop .env/.env.example (credentials live in ansible/vars/default.yml)

.dockerignore

@@ -16,5 +16,9 @@ app/dist
 
 # Ops assets not needed inside the image
 ansible
-scripts/create-collections.sh
+ansible-sample
+Dockerfile-sample
+deploy-sample.sh
+Makefile
 README.md
+scripts/create-collections.sh