Test a curl|sh installer as a fresh user inside a throwaway Docker container

To test a self-hosted install script without clobbering the developer machine (global npm install, ~/.claude/settings.json hooks, ~/.config), run it in a disposable node:NN container with -e HOME=/home/testuser. If the script hardcodes localhost:PORT for the server, forward it inside the container with socat TCP-LISTEN:PORT,fork TCP:host.docker.internal:PORT rather than changing server config. Non-TTY installers usually read prompts line by line, so printf answers piped to sh -c "$(curl ...)" works; check the CLI source for env overrides like a NAME var and the default picker index first.