fix(ci): use dynamic registry namespace for Docker workflow

Author: madisoncarter1234

.github/workflows/docker.yml

@@ -7,7 +7,7 @@ on:
   workflow_dispatch: {}
 
 env:
-  REGISTRY_IMAGE: ghcr.io/base/node-reth-dev
+  REGISTRY_IMAGE: ghcr.io/${{ github.repository_owner }}/node-reth-dev
 
 permissions:
   contents: read