Wrap nixpkgs mealie in dockerTools.buildLayeredImage, replacing the
Node+Python Dockerfile build. nixpkgs ships a single `mealie` gunicorn
entrypoint serving the prebuilt frontend, so this is a clean single-
process wrap; the run wrapper mirrors the NixOS module (init_db Alembic
migrations, then gunicorn). DB stays SQLite on the mealie-data PVC.
Self-pins nixos-unstable (stable lags at 3.9.2) for mealie 3.16.0 -- a
forward 4-minor bump from v3.12.0 (the previously-deferred upgrade).
Breaking-change review v3.13-v3.16: no schema breaks, SQLite auto-migrates
forward; remaining changes minor (see service-versions.yaml notes). Source
PVC retained for rollback. Build verified on ringtail (exit 0, assert ok).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Erich Blume
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