Update gradle.yml

Author: zzdh8

.github/workflows/gradle.yml

@@ -53,6 +53,7 @@ jobs:
          sudo docker login -u ${{ secrets.DOCKER_USERNAME }} -p ${{ secrets.DOCKER_PASSWORD }}
          sudo docker pull ${{ secrets.DOCKER_USERNAME }}/sohwakhaeng:${GITHUB_SHA::7}
          sudo docker tag ${{ secrets.DOCKER_USERNAME }}/sohwakhaeng:${GITHUB_SHA::7} sohwakhaeng
+         sudo docker-compose down
          sudo docker-compose up -d
          sudo docker image prune -f