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Unify container build workflows (#306)
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## Summary
- Merges `build-container.yaml` and `build-container-nix.yaml` into a single workflow
- Detect job classifies each changed container by presence of `Dockerfile` and/or `default.nix`
- Dockerfile containers build on `k8s` (indri) via Dagger; Nix containers build on `nix-container-builder` (ringtail) via nix-build + skopeo
- Containers with both build files (alloy, nettest, ntfy) get built on both runners

## Test plan
- [ ] Push a change to a Dockerfile-only container (e.g. grafana) — verify it builds on k8s only
- [ ] Push a change to a nix-only container (e.g. jobsync) — verify it builds on nix-container-builder only
- [ ] Push a change to a dual container (e.g. ntfy) — verify it builds on both runners
- [ ] Test workflow_dispatch with a specific container name

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Reviewed-on: #306
This commit is contained in:
Erich Blume 2026-03-23 20:55:50 -07:00
commit bd0ff30d3f
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Unified Dockerfile and Nix container build workflows into a single workflow that auto-classifies containers by build type and routes to the correct runner (k8s for Dockerfile, nix-container-builder for Nix). Removed nettest container (outgrown). Nix builds now require an explicit `version = "..."` declaration — no implicit nixpkgs fallback.