changed registry url to ensure docker login is successful

Author: rootware

.github/workflows/cd.yml

@@ -47,7 +47,7 @@ jobs:
         uses: mr-smithers-excellent/docker-build-push@v5
         with:
           image: brootware/pyredactkit
-          registry: hub.docker.com
+          registry: docker.io
           dockerfile: Dockerfile
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}