bin/{uuid,gen-password}: Use /dev/urandom over /dev/random•••As Thomas Pornin eloquently put it[0]:
> use /dev/urandom and be happy; use /dev/random and be sorry
[0]: https://security.stackexchange.com/questions/3936/is-a-rand-from-dev-urandom-secure-for-a-login-key
Revert "bin/ootb: Use hardlinks over symlinks"•••This reverts commit edbf0c2ce376ce6672fbc94d861fe26081c46418.
After adding the "build/" directory to the top-level .gitignore file, it
stopped complaining about the symlinks.
bin/gc: Run GC for user-level Guix first•••When there is 0 bytes of disk left, GPG fails to run because it can't
create a lockfile it requires.
This way, we free space before needing GPG.