Add Submify

[Raktim94]

Summary

Adds Submify — a free, open-source,
self-hostable API-first form-submission and file-upload backend for
websites (drop-in contact/lead forms, presigned S3-compatible uploads with
a zero-config local-disk fallback, calendar/booking, Telegram
notifications).

• Images are pre-built multi-arch (amd64/arm64) and published to
  ghcr.io/raktim94/submify-{api,web,nginx} — public, verified live via
  docker manifest inspect.
• No fixed default secrets: the Postgres password and JWT signing secret
  are generated randomly on first boot into a persisted volume, since this
  is a public compose file.
• Verified locally end-to-end against the real published images: fresh
  install, container restart, and reachability through the nginx main
  service — all confirmed working.

Test plan

• docker compose config -q passes
• docker manifest inspect confirms amd64+arm64 for all three images
• Fresh local install against the real GHCR images boots cleanly and
  the app is reachable
• Container restart preserves the generated secrets and reconnects
  cleanly

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud