Setup environments for Debian on Android

[kachick]

https://www.reddit.com/r/GooglePixel/comments/1j3yrkd/linux_terminal_app_which_was_assumed_to_be/

I have tested this feature on my Pixel. It looks working at least I can install Nix on it.
So setting up the env might be reduced laptop use-case.

• Add CI matrix for arm runner # ref: aarch64-Linux nixpkgs-reviewing-workspace#43
• Provide smaller tool set for the environment # Max 16GiB disk space. And actual free space on my device is less than it.
• (optional) Provide less-typing installer URL for the smartphones

[kachick]

Btw, the Debian image installed curl by default. Debian changed the policy? If then, switching the base container image from Ubuntu to Debian might be simple 🤔

kachick/containers#164
https://github.com/kachick/containers/blob/a59383abc756fc9386021f49e19c7bf98bcd4c6e/images/ubuntu-nix-systemd/Containerfile#L11