diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index 44df3eb..5910cc0 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -39,6 +39,25 @@ jobs:
       - name: Build site
         run: hugo --gc --minify
 
+      - name: Verify /blog-public is host-mounted
+        # 必须 fail-fast,否则 rsync 写到 job 容器临时目录(act_runner container.options
+        # 没生效时 rsync 会自动建临时 /blog-public),build 显示成功但 NAS 上是空的
+        run: |
+          if ! mount | grep -qE '\s/blog-public\s'; then
+            echo "::error::/blog-public is NOT a host mount."
+            echo "act_runner container.options likely not effective. Check runner config + restart."
+            echo ""
+            echo "=== /blog-public state ==="
+            ls -la /blog-public/ 2>&1 || true
+            echo ""
+            echo "=== mount table (top 30) ==="
+            mount | head -30
+            exit 1
+          fi
+          echo "mount verified:"
+          mount | grep '/blog-public'
+          ls -la /blog-public/
+
       - name: Ensure rsync available
         run: which rsync || (sudo apt-get update -qq && sudo apt-get install -y -qq rsync)