fix(deploy): SSH 디버그 + printf 키 저장 (#48)

Co-authored-by: htlee <htlee@gcsc.co.kr>
Co-committed-by: htlee <htlee@gcsc.co.kr>

.gitea/workflows/deploy.yml

@@ -88,11 +88,14 @@ jobs:
           DEPLOY_HOST: 192.168.1.20
         run: |
           mkdir -p ~/.ssh
-          echo "$DEPLOY_KEY" > ~/.ssh/id_deploy
+          printf '%s\n' "$DEPLOY_KEY" > ~/.ssh/id_deploy
           chmod 600 ~/.ssh/id_deploy
-          ssh-keyscan $DEPLOY_HOST >> ~/.ssh/known_hosts 2>/dev/null || true
+          ssh-keyscan -T 5 $DEPLOY_HOST >> ~/.ssh/known_hosts 2>/dev/null || true
 
-          SSH_CMD="ssh -i ~/.ssh/id_deploy -o StrictHostKeyChecking=no root@$DEPLOY_HOST"
+          echo "=== SSH debug: key=$(wc -c < ~/.ssh/id_deploy) bytes, host=$DEPLOY_HOST ==="
+          ssh -v -i ~/.ssh/id_deploy -o StrictHostKeyChecking=no -o ConnectTimeout=10 root@$DEPLOY_HOST 'echo SSH_OK' 2>&1 | grep -E 'Authenticated|Permission|connect|SSH_OK|exit' || true
+
+          SSH_CMD="ssh -i ~/.ssh/id_deploy -o StrictHostKeyChecking=no -o ConnectTimeout=10 root@$DEPLOY_HOST"
 
           $SSH_CMD bash -s << 'RESTART'
           set -e