Update ohhanahana-cd.yml

Author: junseokkim

.github/workflows/ohhanahana-cd.yml

@@ -63,7 +63,7 @@ jobs:
         uses: appleboy/ssh-action@master
         with:
           host: ${{ secrets.EC2_HOST }}
-          username: ec2-user
+          username: ubuntu
           key: ${{ secrets.SSH_KEY }}
           script: |
             sudo docker stop $(docker ps -a -q --filter "name=ohhanahana-app") || true