test: ssh connection check

.gitea/workflows/test-ssh.yml

@@ -0,0 +1,25 @@
+name: Test SSH Connection
+on:
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Test SSH
+        env:
+          STAGING_SSH_KEY: ${{ secrets.STAGING_SSH_KEY }}
+          STAGING_HOST: ${{ secrets.STAGING_HOST }}
+          STAGING_USER: ${{ secrets.STAGING_USER }}
+        run: |
+          echo "$STAGING_SSH_KEY" > /tmp/key_raw
+          if head -1 /tmp/key_raw | grep -q "BEGIN OPENSSH"; then
+            cp /tmp/key_raw /tmp/key
+          else
+            base64 -d /tmp/key_raw > /tmp/key
+          fi
+          chmod 600 /tmp/key
+          echo "=== Key fingerprint ==="
+          ssh-keygen -l -f /tmp/key
+          echo "=== SSH Test ==="
+          ssh -i /tmp/key -p 2222 -o StrictHostKeyChecking=no $STAGING_USER@$STAGING_HOST "echo SSH_OK && docker ps --format '{{.Names}}' | head -3"