feat: publish multi-arch Docker images to GHCR - #56
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Installing via Docker previously required cloning the repo to build the image locally. Publish prebuilt images instead so a compose file (or a plain docker run) is enough. - Add .github/workflows/docker-publish.yml, building linux/amd64 and linux/arm64 and pushing to ghcr.io/juancf/nutwatch. Version tags publish :X.Y.Z, :X.Y, :X and :latest; pushes to main publish a rolling :main. Pull requests build amd64 only and push nothing. Auth uses the built-in GITHUB_TOKEN, so no registry secrets are needed. - Pin the frontend build stage to $BUILDPLATFORM. The SPA and the backend sources copied alongside it are arch-independent, so npm no longer runs under QEMU emulation when cross-building the arm64 image. - Point docker-compose.yml at the published image, keeping `build: .` available as a commented-out option for source builds. - Document the pull-based install, the tag scheme and the upgrade path in README.md, and note the image tags in the release checklist.
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📝 WalkthroughWalkthroughThe repository adds a GitHub Actions workflow for multi-architecture Docker publishing to GHCR. Docker Compose now uses the published image by default. The README and contributor documentation describe image tags, releases, upgrades, and source builds. ChangesDocker image distribution
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The release workflow can publish container images with write access, but its actions are not pinned to immutable commits; a changed or compromised action could therefore publish unauthorized images. Merge should wait for the actions to be pinned or for this risk to be explicitly accepted. Sequence Diagram(s)sequenceDiagram
participant GitHub Actions
participant Metadata Action
participant Buildx
participant GHCR
GitHub Actions->>Metadata Action: Generate image tags
Metadata Action-->>GitHub Actions: Return semver, main, or PR tags
GitHub Actions->>Buildx: Build target platforms
Buildx->>GHCR: Push images for main and version tag events
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (5 skipped: 5 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In @.github/workflows/docker-publish.yml:
- Line 28: Pin all six action references in .github/workflows/docker-publish.yml
at lines 28, 33, 36, 41, 52, and 66 to reviewed full commit SHAs, preserving
their existing action versions and workflow behavior.
In `@README.md`:
- Around line 447-449: Update the fenced code block containing
ghcr.io/juancf/nutwatch to use text as its declared language by changing the
opening fence to ```text.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
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.github/workflows/docker-publish.ymlCONTRIBUTING.mdDockerfileREADME.mddocker-compose.yml
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release.yml gates every job behind check-tag-branch, so a tag that is not an ancestor of main is rejected before anything is published. The Docker workflow had no equivalent, so such a tag would still publish an image — including :latest. The two workflows disagreed about what a valid release is, and the stricter one was the one that did not touch the registry. - Add the same check-tag-branch guard, scoped to tag pushes, and make the build job depend on it. The build's !cancelled() && !failure() condition keeps branch and pull-request runs working while the guard is skipped, and still blocks the build when the guard rejects a tag. - Set flavor latest=false and apply :latest through an explicit raw entry gated on the tag being the highest v*.*.* in the repo. metadata-action's latest=auto tags :latest on any semver tag with no version comparison, so re-pushing an older tag would have dragged :latest backwards onto a superseded release.
Address CodeRabbit review feedback on #56. The build job holds packages: write and can publish to GHCR, so a moving major-version tag on any of its actions is a path to unauthorized image publishes. Pin all six to the commit SHA each tag currently resolves to, with the human-readable version retained in a trailing comment. Also declare a restrictive top-level permissions block, matching lint.yml and silencing zizmor's excessive-permissions warning; both jobs already set their own permissions, so effective access is unchanged. Label the registry fence in README.md as text (markdownlint MD040), consistent with the other fences in the file.
2 participants
Why
Installing NutWatch with Docker currently means cloning the repo, because
docker-compose.ymlbuilds the image locally. Publishing prebuilt imagesremoves that step — a compose file (or a plain
docker run) is enough.What
Adds
.github/workflows/docker-publish.yml, which buildslinux/amd64+linux/arm64and pushes a single multi-arch manifest toghcr.io/juancf/nutwatch.v1.3.0tag:1.3.0,:1.3,:1,:latestmain:main(rolling)Authentication uses the built-in
GITHUB_TOKENwithpackages: write, sothere are no registry secrets to configure. Layer caching uses
type=gha.Publish guards
release.ymlgates every job behindcheck-tag-branch, so a tag that isnot an ancestor of
mainnever publishes a tarball. The Docker workflownow mirrors that, closing two ways a bad tag could reach the registry:
main. The samecheck-tag-branchguard runs for tagpushes, and the build depends on it. Previously a tag pushed from a
feature branch would have its tarball release correctly rejected while
the image published anyway.
:latestonly moves forward.metadata-action's defaultlatest=autotags:lateston any semver tag with no versioncomparison, so re-pushing an older tag would drag
:latestbackwardsonto a superseded release.
latestis now set tofalseand appliedthrough an explicit entry gated on the tag being the highest
v*.*.*in the repo.
Note that registry tags are mutable: re-publishing an existing version
silently overwrites it and leaves the previous image untagged but stored.
These guards limit which tags can trigger that, not the overwrite itself.
Supporting changes:
Dockerfile— pin the frontend stage to--platform=$BUILDPLATFORM.The SPA and the backend sources copied alongside it are arch-independent,
so
npm ci/vite buildrun natively instead of under QEMU whencross-building arm64. This is the difference between roughly 10 and 30+
minutes on the arm64 leg.
docker-compose.yml— nowimage: ghcr.io/juancf/nutwatch:latest,with
build: .retained as a commented-out option for source builds.README.md— Docker section leads with pulling the image (includinga
curlof just the compose file), plus the tag table and adocker compose pull && up -dupgrade path.CONTRIBUTING.md— image tags added to the release checklist.Testing
--target frontend-builder --platform linux/arm64succeeds on a machine with no arm64 binfmt registered andhits the amd64 layer cache, confirming npm never runs emulated.
docker compose configresolves to the new image.check-tag-branchskips (not a tag), the build still runs, GHCR login skips,
push: false,and the only tag produced is
pr-56— confirming the:latestgateresolves to
falsewhen the guard job is skipped.including that
v1.10.0correctly outranksv1.3.0(sort -V).Not verified locally: the full arm64 runtime layer (the
apt-get install nut-server …step), since this machine has no arm64emulation. The first workflow run exercises it.
Note for after merge
The first workflow run creates the GHCR package as private. It needs a
one-time flip to public under Packages → nutwatch → Package settings →
Change visibility before anonymous
docker pullworks.armv7 (32-bit ARM — Pi 2/3, or a Pi 4 on a 32-bit OS) is not included.
Both base images do publish
arm/v7, so it would be a one-line addition,but it has no native runner and builds entirely under emulation.