Docker - Fix publish docker image in GitHub Registry (ggml-org#235)

* fix publish permission

* try to fix docker pipeline using as password github_token & username repository_owner

Author: bernatvadell

.github/workflows/docker.yml

@@ -40,7 +40,7 @@ jobs:
         uses: docker/login-action@v2
         with:
           registry: ghcr.io
-          username: ${{ github.actor }}
+          username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push Docker image (versioned)