blumeops/.forgejo/workflows/build-container.yaml
Erich Blume 695089499e Nix container build for nettest (#214)
## Summary
- Add `containers/nettest/default.nix` using `dockerTools.buildLayeredImage` with curl, jq, dnsutils, cacert, and bash — equivalent to the existing Dockerfile
- Update `container-tag-and-release` to require `--nix` or `--dockerfile` flag when both build types exist for a container
- Update `container-list` to show `[dockerfile+nix]` label when both exist

## Deployment and Testing
- [ ] SSH to ringtail, run `nix build -f containers/nettest/default.nix -o result` to verify the nix expression builds
- [ ] Tag `nettest-nix-v1.0.0`, confirm `build-container-nix` workflow runs on `nix-container-builder` runner and pushes to registry
- [ ] Smoke test on ringtail k3s: `kubectl run nettest --image=registry.ops.eblu.me/blumeops/nettest:v1.0.0 --restart=Never && kubectl logs nettest`
- [ ] Verify `mise run container-list` shows `[dockerfile+nix]` for nettest
- [ ] Verify `mise run container-tag-and-release nettest v1.1.0` prompts for build type

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/214
2026-02-19 08:42:58 -08:00

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YAML

# Generic container build workflow
# Triggers on tags matching: <container>-v<version>
# Builds from containers/<container>/Dockerfile if it exists
#
# Uses Dagger to build and push images to the Zot registry.
#
# Examples:
# nettest-v1.0.0 -> builds containers/nettest/
# devpi-v2.1.0 -> builds containers/devpi/
# foo-v1.0.0 -> skips if containers/foo/ doesn't exist
name: Build Container
on:
push:
tags:
- '*-v[0-9]*'
jobs:
build:
runs-on: k8s
steps:
- name: Parse tag
id: parse
run: |
TAG="${GITHUB_REF_NAME}"
echo "Tag: $TAG"
# Extract container name (everything before -v)
# e.g., "nettest-v1.0.0" -> "nettest", "my-app-v2.0.0" -> "my-app"
CONTAINER="${TAG%-v[0-9]*}"
VERSION="${TAG#"${CONTAINER}"-}"
echo "container=$CONTAINER" >> "$GITHUB_OUTPUT"
echo "version=$VERSION" >> "$GITHUB_OUTPUT"
echo "Container: $CONTAINER"
echo "Version: $VERSION"
- name: Checkout
uses: actions/checkout@v4
- name: Check if container exists
id: check
run: |
CONTAINER="${{ steps.parse.outputs.container }}"
CONTEXT="containers/$CONTAINER"
if [ -f "$CONTEXT/Dockerfile" ]; then
echo "Found $CONTEXT/Dockerfile"
echo "exists=true" >> "$GITHUB_OUTPUT"
else
echo "No Dockerfile found at $CONTEXT/Dockerfile"
echo "exists=false" >> "$GITHUB_OUTPUT"
fi
- name: Skip if container not found
if: steps.check.outputs.exists != 'true'
run: |
echo "========================================"
echo "Container not found: ${{ steps.parse.outputs.container }}"
echo "========================================"
echo ""
echo "Tag '${{ github.ref_name }}' does not match any container in containers/"
echo ""
echo "Available containers:"
find containers -maxdepth 1 -mindepth 1 -type d -exec basename {} \; 2>/dev/null | sort | while read -r name; do
echo " - $name"
done || echo " (none)"
echo ""
echo "Skipping build."
- name: Publish
if: steps.check.outputs.exists == 'true'
run: |
dagger call publish \
--src=. \
--container-name=${{ steps.parse.outputs.container }} \
--version=${{ steps.parse.outputs.version }}