[github post-release] also publish to stable S3 bucket

Author: savil

.github/workflows/cli-post-release.yml

@@ -25,3 +25,4 @@ jobs:
           tmp_file=$(mktemp)
           echo "${{ github.ref_name }}" > $tmp_file
           aws s3 cp $tmp_file s3://releases.jetpack.io/devbox/latest/version
+          aws s3 cp $tmp_file s3://releases.jetpack.io/devbox/stable/version