Add github actions job

Pushs image to dockerhub
Also hard tag jenkins image version

.github/workflows/main.yml

@@ -0,0 +1,113 @@
+name: Unit Tests & Tagged Deploy
+
+# based on: https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners
+
+on:
+  push:
+    tags:
+    - 'v*'
+
+env:
+  REGISTRY_IMAGE: dhilsfu/jenkins
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
+          - linux/ppc64le
+          # - linux/s390x
+
+    steps:
+    - name: Prepare
+      run: |
+        platform=${{ matrix.platform }}
+        echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+
+    - name: Checkout source code
+      uses: actions/checkout@v4
+
+    - name: Docker meta
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: ${{ env.REGISTRY_IMAGE }}
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Login to Docker Hub
+      uses: docker/#-action@v3
+      with:
+        username: ${{ secrets.DOCKER_HUB_USERNAME }}
+        password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+    - name: Build and push by digest
+      id: build
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        platforms: ${{ matrix.platform }}
+        labels: ${{ steps.meta.outputs.labels }}
+        outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+        cache-from: type=registry,ref=${{ env.REGISTRY_IMAGE }}:buildcache-${{ env.PLATFORM_PAIR }}
+        cache-to: type=registry,ref=${{ env.REGISTRY_IMAGE }}:buildcache-${{ env.PLATFORM_PAIR }},mode=max
+
+    - name: Export digest
+      run: |
+        mkdir -p /tmp/digests
+        digest="${{ steps.build.outputs.digest }}"
+        touch "/tmp/digests/${digest#sha256:}"
+
+    - name: Upload digest
+      uses: actions/upload-artifact@v4
+      with:
+        name: digests-${{ env.PLATFORM_PAIR }}
+        path: /tmp/digests/*
+        if-no-files-found: error
+        retention-days: 1
+
+  push:
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
+    needs:
+    - build
+    steps:
+    - name: Download digests
+      uses: actions/download-artifact@v4
+      with:
+        path: /tmp/digests
+        pattern: digests-*
+        merge-multiple: true
+
+    - name: Docker meta
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: ${{ env.REGISTRY_IMAGE }}
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Login to Docker Hub
+      uses: docker/#-action@v3
+      with:
+        username: ${{ secrets.DOCKER_HUB_USERNAME }}
+        password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+    - name: Create manifest list and push
+      working-directory: /tmp/digests
+      run: |
+        docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+          $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
+
+    - name: Inspect image
+      run: |
+        docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}

Dockerfile

@@ -1,4 +1,4 @@
-FROM jenkins/jenkins:lts-jdk21
+FROM jenkins/jenkins:2.492.1-lts-jdk21
 
 # setup docker cli
 USER root