Use buildah directly for building because docker-related action doesn…

…'t support '--squash' flag

.github/workflows/build.yml

@@ -1,17 +1,25 @@
 name: Build Docker Image
 on:
   push:
-    branches:
-      - 'main'
+    paths:
+      - 'Dockerfile'
+      - '.github/workflows/build.yml'
   schedule:
     - cron: '0 0 * * 0'
 
+env:
+    IMAGE_NAME: ptr-test
+    IMAGE_TAGS: v1 ${{ github.sha }}
+    IMAGE_REGISTRY: ghcr.io/${{ github.repository_owner }}
+    REGISTRY_USER: ${{ github.actor }}
+    REGISTRY_PASSWORD: ${{ github.token }}
+
 jobs:
-  docker:
+  push-ghcr:
+    name: Build and push image
     runs-on: ubuntu-latest
     steps:
-      -
-        run: |
+      - run: |
           echo "GitHub Event name: ${{ github.event_name }}"
           # We run this every week and skip building when no update from the spark package
           if [ "${{ github.event_name }}" != "push" ]; then
@@ -23,20 +31,18 @@ jobs:
               exit 1
             fi
           fi
-      -
-        name: Checkout
+
+      - name: Checkout project
         uses: actions/checkout@v4
-      -
-        name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      -
-        name: Build and push
-        uses: docker/build-push-action@v5
+
+      - run: buildah build --squash -t spark-wechat .
+
+      - name: Push To GHCR
+        uses: ./
+        id: push
         with:
-          context: .
-          push: true
-          tags: wechat-spark:${{ github.run_number }} 
+          image: spark-wechat
+          tags: latest
+          registry: ${{ env.IMAGE_REGISTRY }}
+          username: ${{ env.REGISTRY_USER }}
+          password: ${{ env.REGISTRY_PASSWORD }}