dashboard: a Slipstream page - #84

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

apt-get install failed against the image's package index. Refreshing it once, then retrying. If this becomes routine, the runner image's lists have drifted and this script's assumption needs revisiting.