feat: add CI to build and push docker image to Github package (#1) (#512)

Author: JinIgarashi

.github/workflows/ci.yml

@@ -2,8 +2,8 @@ name: "Continuous Integration"
 
 on:
   push:
-  pull_request:
     branches: [ master ]
+  pull_request:
 
 env:
   AREA: liechtenstein
@@ -117,3 +117,39 @@ jobs:
       with:
         input: ${{ env.AREA }}.osm.pbf 
         output: ${{ env.AREA }}.mbtiles
+
+  docker-build:
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        if: ${{ github.ref == 'refs/heads/master'}}
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}