fix(ci): auto-approve checkout改用tar.gz方式，避免缓存损坏

.gitea/workflows/auto-approve.yml

@@ -12,7 +12,10 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        shell: sh
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run: "set -eu\npython3 - <<'PY'\nimport io, os, tarfile, time, urllib.request, urllib.error\nurl = f\"{os.environ['GITHUB_API_URL']}/repos/{os.environ['GITHUB_REPOSITORY']}/archive/{os.environ['GITHUB_SHA']}.tar.gz\"\nrequest = urllib.request.Request(url, headers={\"Authorization\": f\"token {os.environ['GITHUB_TOKEN']}\"})\nlast_err = None\nfor attempt in range(5):\n    try:\n        with urllib.request.urlopen(request, timeout=120) as response:\n            archive = response.read()\n        break\n    except urllib.error.HTTPError as e:\n        last_err = e\n        if e.code >= 500 and attempt < 4:\n            wait = 2 ** attempt\n            print(f\"Checkout HTTP {e.code}, retrying in {wait}s (attempt {attempt+1}/5)...\")\n            time.sleep(wait)\n            continue\n        raise\n    except Exception as e:\n        last_err = e\n        if attempt < 4:\n            wait = 2 ** attempt\n            print(f\"Checkout error: {e}, retrying in {wait}s (attempt {attempt+1}/5)...\")\n            time.sleep(wait)\n            continue\n        raise\nelse:\n    raise last_err\nwith tarfile.open(fileobj=io.BytesIO(archive), mode='r:gz') as tar:\n    root_prefix = tar.getmembers()[0].name.split('/', 1)[0] + '/'\n    for member in tar.getmembers():\n        name = member.name\n        if name == root_prefix[:-1]:\n            continue\n        if name.startswith(root_prefix):\n            member.name = name[len(root_prefix):]\n        if member.name:\n            tar.extract(member, '.')\nPY\n"
 
       - name: Auto approve when CI passes
         shell: bash