test Harbor push (#362)

.github/workflows/harbor-build-forecast-etl.yml

@@ -0,0 +1,31 @@
+name: Harbor build and publish forecast ETL docker images
+
+on:
+  [workflow_dispatch]
+
+jobs:
+  publish_image:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Login to Harbor
+        uses: docker/login-action@v3
+        with:
+          registry: eccr.ecmwf.int
+          username: ${{ secrets.HARBOR_USERNAME }}
+          password: ${{ secrets.HARBOR_PASSWORD }}
+
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          buildkitd-flags: --debug
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: ./air-quality-backend
+          file: ./air-quality-backend/Dockerfile.forecast
+          platforms: linux/amd64
+          push: true
+          tags: "eccr.ecmwf.int/cams-applications/vairify-etl-forecast:latest"