New comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/issues/26967#issuecomment-740577300

Comment:
The actual install scripts inside the package is generated, i.e. anything that requires a trigger is added to the script and the `INSTALL` file is just appended to it.

Not using the shebang is probably done, to allow `xbps-install -r foo` without root (which would be required for chroot) to use the shell from the chroot and not from the host system.