fix(ui): accept runtime config placeholders - #83

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, actions/setup-go@v3, actions/setup-node@v4, robinraju/release-downloader@v1.7. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/