resolving the issue #14 Change GHA Runner image name

Signed-off-by: Ryder-07 <[email protected]>

Author: Ryder-07

.github/workflows/publish-image.yml

@@ -18,8 +18,9 @@ on:
 env:
   # Use docker.io for Docker Hub if empty
   REGISTRY: ghcr.io
-  # github.repository as <account>/<repo>
+  # IMAGE_NAME maps to the Docker image name
   IMAGE_NAME: cncf/external-gha-runner
+
   # Map current release tag to the version of booty
   BOOTY_VERSION: $GITHUB_REF_NAME
   # Map last repo update to the build timestamp