fix(ci): SLSA3 support

Signed-off-by: PoAn Yang <[email protected]>

.github/workflows/build.yml

@@ -62,13 +62,18 @@ jobs:
         username: ${{ env.DOCKER_USERNAME }}
         password: ${{ env.DOCKER_PASSWORD }}
 
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
     # rancher/harvester-cluster-repo image
     - name: docker-publish-harvester-cluster-repo
-      if: ${{ startsWith(github.ref, 'refs/heads/') }}
-      uses: docker/build-push-action@v5
+      # if: ${{ startsWith(github.ref, 'refs/heads/') }}
+      uses: docker/build-push-action@v6
       with:
         context: dist/harvester-cluster-repo
-        push: true
+        # push: true
         platforms: linux/${{ matrix.arch }}
         tags: rancher/harvester-cluster-repo:${{ env.branch }}-head-${{ matrix.arch }}
         file: dist/harvester-cluster-repo/Dockerfile