[FIX] cicd 오타 수정

Author: hyunbin1

.github/workflows/cicd.yml

@@ -57,7 +57,7 @@ jobs:
       - name: Deploy to EC2
         uses: appleboy/ssh-action@master
         with:
-          host: ${{ secrets.SSH_HOST }}
+          host: ${{ secrets.SSH_KNOWN_HOSTS }}
           username: ${{ secrets.SSH_USER }}
           key: ${{ secrets.SSH_PRIVATE_KEY }}
           script: |