chore: fix docker login

Author: ldez

.github/workflows/release.yml

@@ -29,7 +29,7 @@ jobs:
       - name: dockerhub-login
         uses: docker/login-action@v1
         with:
-          username: ${{ secrets.DOCKER_USERNAME }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: ghcr-login