Update docker-publish.yml

Author: Tofandel

.github/workflows/docker-publish.yml

@@ -17,7 +17,7 @@ on:
 
 env:
   # Use docker.io for Docker Hub if empty
-  REGISTRY: ""
+  REGISTRY: docker.io
   # github.repository as <account>/<repo>
   IMAGE_NAME: tofandel/php_node