change docker related secret name

Author: Revolyssup

.github/workflows/docker-push.yml

@@ -49,8 +49,9 @@ jobs:
         name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
-          username: ${{ secrets.DOCKERHUB_USER }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: ${{ secrets.DOCKER_REGISTRY }}
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
       -
         name: Build and push
         uses: docker/build-push-action@v5