Add GitHub Action to publish images

.github/workflows/docker.yaml

@@ -0,0 +1,35 @@
+name: Build Docker Images
+
+on:
+  push:
+    branches:
+      - "package-services"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        app:
+          - name: flights
+            dir: flight-data/flights
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: ${{ matrix.app.dir }}
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: ghcr.io/Kong/kongair-${{ matrix.app.name }}:latest