chore: try to append execution permission

Signed-off-by: STRRL <[email protected]>

Author: STRRL

.github/workflows/upload_image.yaml

@@ -91,7 +91,7 @@ jobs:
           GITHUB_REPOSITORY_OWNER: ${{ github.repository_owner }}
         run: |
           # permissions would be lost after transfer by github artifacts, see: https://github.com/chaos-mesh/k8s_dns_chaos/issues/20
-          chmod +x coredns
+          chmod +x coredns/coredns
           docker build -t ghcr.io/${GITHUB_REPOSITORY_OWNER,,}/chaos-coredns:$IMAGE_TAG-$ARCH .
 
       - name: Upload Chaos CoreDNS