ci: add GitHub Actions workflow for building and publishing Docker image

Author: alexjustesen

.github/workflows/release.yml

@@ -0,0 +1,86 @@
+name: Build and Publish Docker Image
+
+on:
+  repository_dispatch:
+    types: [speedtest-tracker-release]
+  workflow_dispatch:
+    inputs:
+      release_tag:
+        description: 'Release tag from speedtest-tracker repository'
+        required: true
+        type: string
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{version}},value=${{ github.event.client_payload.tag_name || inputs.release_tag }}
+            type=semver,pattern={{major}}.{{minor}},value=${{ github.event.client_payload.tag_name || inputs.release_tag }}
+            type=semver,pattern={{major}},value=${{ github.event.client_payload.tag_name || inputs.release_tag }}
+            type=raw,value=latest
+
+      - name: Determine release tag
+        id: release-tag
+        run: |
+          # Get the release tag from either repository_dispatch or workflow_dispatch
+          if [[ "${{ github.event_name }}" == "repository_dispatch" ]]; then
+            RELEASE_TAG="${{ github.event.client_payload.tag_name }}"
+          elif [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
+            RELEASE_TAG="${{ inputs.release_tag }}"
+          else
+            echo "Unexpected event type: ${{ github.event_name }}"
+            exit 1
+          fi
+
+          # Remove 'v' prefix if present
+          RELEASE_TAG="${RELEASE_TAG#v}"
+          echo "release_tag=${RELEASE_TAG}" >> $GITHUB_OUTPUT
+          echo "Using release tag: ${RELEASE_TAG}"
+
+      - name: Build and push Docker image
+        id: build
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            RELEASE_TAG=${{ steps.release-tag.outputs.release_tag }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v1
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          subject-digest: ${{ steps.build.outputs.digest }}
+          push-to-registry: true