[seekdb][observer] Size automatic log disk from available space - #1325

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3, oceanbase/github-translate-action@ob-1.1.2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/