add support for upgrading edge cluster

Author: daniellrr

.github/workflows/docker_build_upgrade_k8s.yml

@@ -36,6 +36,6 @@ jobs:
       uses: docker/build-push-action@v5
       with:
         context: .
-        file: ./upgrade_edge/Dockerfile
+        file: upgrade_edge/Dockerfile
         push: true
         tags: ghcr.io/${{ github.repository_owner }}/edgek8s-upgrade:latest