ghactions: publish docker image

.github/workflows/publish-docker-image.yml

@@ -0,0 +1,33 @@
+name: "Publish Docker image"
+
+on: push
+
+jobs:
+  push_to_registry:
+    name: "Push Docker image to Docker Hub"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Check out the repo"
+        uses: actions/checkout@v2
+
+      - name: "Log in to Docker Hub"
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: "Extract metadata (tags, labels) for Docker"
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: jmlemetayer/abba
+          flavor: |
+            latest=true
+
+      - name: "Build and push Docker image"
+        uses: docker/build-push-action@v2
+        with:
+          context: docker
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}