Adds GitHub workflow (#8)

* adds github workflow
---------

Co-authored-by: Jens Plüddemann <[email protected]>

.github/workflows/docker-build-and-push.yml

@@ -0,0 +1,64 @@
+name: Create and publish a Docker image
+
+on:
+  push:
+    branches: ["**"] # run for any commit or tag push on any branch
+    tags-ignore: ["v**"] # reserve v* tags for releases
+
+jobs:
+  build-and-push-image:
+    name: Build and publish docker images
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - dockerfile: Dockerfile
+            image: ghcr.io/${{ github.repository }}-application
+            context: .
+          - dockerfile: tutorial/Dockerfile
+            image: ghcr.io/${{ github.repository }}-tutorial
+            context: tutorial
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ matrix.image }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
+
+      - name: Build and Push Digest
+        id: build
+        uses: docker/build-push-action@v5
+        with:
+          context: ${{ matrix.context }}
+          file: ${{ matrix.dockerfile }}
+          platforms: linux/amd64, linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          push: true

docker-compose.yml

@@ -1,9 +1,9 @@
 services:
   application:
+    image: ghcr.io/jensereal/otel-getting-started-application:adds-github-workflow
     build:
       context: .
       dockerfile: Dockerfile
-    image: otel-getting-started-application:latest
     tty: true
     volumes:
       - ./labs:/workspace
@@ -14,7 +14,7 @@ services:
     image: kennethreitz/httpbin
 
   tutorial:
-    image: otel-getting-started-tutorial:latest
+    image:  ghcr.io/jensereal/otel-getting-started-tutorial:adds-github-workflow
     build:
       context: tutorial/
       dockerfile: Dockerfile