Always try to build the docker container but only push if merging to …

…main.

.github/workflows/docker-image.yml

@@ -27,13 +27,6 @@ jobs:
         with:
           images: trackabout/snappass
 
-      - name: Log in to Docker Hub
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKER_HUB_USERNAME }}
-          password: ${{ secrets.DOCKER_HUB_KEY }}
-
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
 
@@ -48,12 +41,19 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-buildx-
 
+      - name: Log in to Docker Hub
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_KEY }}
+
       - name: Build container image, publish if not a PR
         uses: docker/build-push-action@v5
         with:
           context: .
-          push: ${{ github.event_name != 'pull_request' }}
+          push: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache
+          cache-from: type=gha,scope=${{ github.repository }}
+          cache-to: type=gha,mode=max,scope=${{ github.repository }}