Sync run-in-docker.sh from generic-test-runner; move run-in-docker scripts into bin/ - #91

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744, actions/setup-node@v3, docker/build-push-action@2eb1c1961a95fc15694676618e422e8ba1d63825, docker/setup-buildx-action@4c0219f9ac95b02789c1075625400b2acbff50b1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/