ci: 将 workflow 的 runs-on 改为 internal_docker

自托管 Gitea runner 只注册了 internal_docker 标签，ubuntu-latest 会导致 job 永远排队。

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/release.yml

@@ -19,7 +19,7 @@ permissions:
 jobs:
   portable-windows-full:
     name: Portable Windows full bundle (Node + OpenClaw pre-installed)
-    runs-on: ubuntu-latest
+    runs-on: internal_docker
     steps:
       - uses: actions/checkout@v4
 
@@ -224,7 +224,7 @@ jobs:
   publish:
     name: Publish GitHub Release
     needs: [portable-windows-full]
-    runs-on: ubuntu-latest
+    runs-on: internal_docker
     steps:
       - uses: actions/checkout@v4