fix: SSH 키를 env 변수로 전달하여 YAML 들여쓰기 오염 방지

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/deploy.yml

@@ -24,21 +24,15 @@ jobs:
       - name: Build
         run: npm run build
 
-      - name: Debug SSH key
-        run: |
-          echo "=== key line count ==="
-          echo "${{ secrets.SSH_PRIVATE_KEY }}" | wc -l
-          echo "=== first line ==="
-          echo "${{ secrets.SSH_PRIVATE_KEY }}" | head -1
-          echo "=== last line ==="
-          echo "${{ secrets.SSH_PRIVATE_KEY }}" | tail -1
 
       - name: Deploy via SCP
+        env:
+          SSH_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
+          SSH_HOST: ${{ secrets.SSH_HOST }}
+          SSH_PORT: ${{ secrets.SSH_PORT }}
         run: |
           mkdir -p ~/.ssh
-          printf '%s' "${{ secrets.SSH_PRIVATE_KEY }}" | tr -d '\r' > ~/.ssh/deploy_key
+          echo "$SSH_KEY" > ~/.ssh/deploy_key
           chmod 600 ~/.ssh/deploy_key
-          echo "=== key validation ==="
-          ssh-keygen -l -f ~/.ssh/deploy_key || echo "KEY INVALID"
-          ssh-keyscan -p ${{ secrets.SSH_PORT }} -H ${{ secrets.SSH_HOST }} >> ~/.ssh/known_hosts
-          scp -P ${{ secrets.SSH_PORT }} -i ~/.ssh/deploy_key -o IdentitiesOnly=yes -r dist/* root@${{ secrets.SSH_HOST }}:/var/www/proto.bodalab.diffthink.kr/
+          ssh-keyscan -p "$SSH_PORT" -H "$SSH_HOST" >> ~/.ssh/known_hosts
+          scp -P "$SSH_PORT" -i ~/.ssh/deploy_key -o IdentitiesOnly=yes -r dist/* root@"$SSH_HOST":/var/www/proto.bodalab.diffthink.kr/