Add GHCR container CI

Author: abarmitage

.github/workflows/container.yml

@@ -0,0 +1,86 @@
+name: Energy Tracker CI
+
+on:
+  push:
+    tags:
+      - 'energy-tracker-*'
+    paths:
+      - '**'
+      - '.github/workflows/container.yml'
+  pull_request:
+    paths:
+      - '**'
+      - '.github/workflows/container.yml'
+
+defaults:
+  run:
+    working-directory: .
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+
+      - name: Compile check
+        run: |
+          python -m compileall octopus_agile_tracker
+
+      - name: Unit tests
+        run: python -m unittest discover -s tests -v
+
+  publish:
+    runs-on: ubuntu-latest
+    needs: test
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/energy-tracker-')
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Compute image tag
+        id: image_tag
+        run: |
+          ref="${GITHUB_REF_NAME}"
+          ver="${ref#energy-tracker-}"
+          ver="${ver#v}"
+          owner="${GITHUB_REPOSITORY_OWNER,,}"
+          echo "version=${ver}" >> "$GITHUB_OUTPUT"
+          echo "owner=${owner}" >> "$GITHUB_OUTPUT"
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          build-args: |
+            ENERGY_TRACKER_VERSION=${{ steps.image_tag.outputs.version }}
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            ghcr.io/${{ steps.image_tag.outputs.owner }}/energy-tracker:${{ steps.image_tag.outputs.version }}
+            ghcr.io/${{ steps.image_tag.outputs.owner }}/energy-tracker:latest
+          cache-from: type=gha,scope=energy-tracker
+          cache-to: type=gha,mode=max,scope=energy-tracker

Dockerfile

@@ -1,11 +1,12 @@
 # syntax=docker/dockerfile:1.7
 FROM python:3.13-slim
 
+ARG ENERGY_TRACKER_VERSION="unknown"
 ENV PYTHONUNBUFFERED=1
+ENV ENERGY_TRACKER_VERSION=${ENERGY_TRACKER_VERSION}
 WORKDIR /app
 
 COPY octopus_agile_tracker /app/octopus_agile_tracker
 
 USER nobody
 ENTRYPOINT ["python", "-m", "octopus_agile_tracker.main"]
-

README.md

@@ -66,3 +66,9 @@ docker run --rm \
   energy-tracker:dev
 ```
 
+Version tags in the form `energy-tracker-<version>` are built by GitHub Actions
+and pushed to:
+
+```text
+ghcr.io/clythershackers/energy-tracker
+```