ci: update workflow and build the images in PRs without pushing it (#30)

Signed-off-by: Stefan Dej <meteyou@gmail.com>

.github/workflows/publish.yml

@@ -8,6 +8,8 @@ name: Create and publish a Docker image
 on:
   push:
     branches: ['master']
+  pull_request:
+    branches: ['master']
 
 env:
   REGISTRY: ghcr.io
@@ -22,10 +24,10 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Log in to the Container registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
@@ -33,14 +35,15 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
-          push: true
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |