Update github-docker-registry-push.yml

Author: gounthar

.github/workflows/github-docker-registry-push.yml

@@ -91,8 +91,8 @@ jobs:
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          username: ${{ env.GHCR_USERNAME }}
+          password: ${{ env.GHCR_TOKEN }}
 
       - name: Extract branch name
         # This step extracts the branch name