Add GitHub Actions example

.github/workflows/airflow-publish-container.yaml

@@ -0,0 +1,40 @@
+# This workflow uses actions to build and publish airflow image on a
+# container registry.
+name: Airflow
+run-name: Publish Airflow Docker image
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+jobs:
+  push_to_registry:
+    name: Push Airflow Docker image to container registry
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - name: Check out the code
+        uses: actions/checkout@v4
+      - name: Log in to container registry
+        uses: docker/login-action@v3
+        with:
+          registry: docker.registry
+          username: dockeruser
+          password: dockerpassword
+      - name: Extract docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: dockeruser/dockerimage
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./docker/airflow/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+