SDRausty/termux-archlinux ? reverse-engineered prompt

Build me a simple bash based installer that sets up Arch Linux inside Termux on Android, Chromebook, and Fire OS devices.

I want it to be something a regular person can download, run with bash, and then end up in an Arch Linux command prompt inside a Termux PRoot container. It should handle the setup steps for me, give clear messages while it runs, and include a way to start the Arch environment afterward with a command like startarch.

Please make it work on phone and tablet sized screens, and keep it friendly for people who are not Linux experts. If there are different setup options, make them easy to choose and explain in plain language. Also include basic checks, useful error messages, and anything needed so the install is reliable on Termux.

If you need to look up current Termux or Arch docs online while building it, go ahead.