fix : cd 수정

cd 정상 작동 테스트

Author: lsh1215

.github/workflows/cd.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           host: ${{ secrets.SERVER_HOST }}
           username: ${{ secrets.SERVER_USER }}
-          key: ${{ secrets.SERVER_SSH_KEY }}
+          key: ${{ secrets.SERVER_PEM_KEY }}
           source: .
           target: /home/ubuntu/app