CI: Fix workflow

Author: mrkn

.github/workflows/ci.yml

@@ -44,7 +44,7 @@ jobs:
     - name: Login to DockerHub
       if: github.ref == 'refs/heads/master'
       uses: docker/login-action@v1
-      env:
+      with:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_TOKEN }}