When packages are built using guix build --keep-failed the build directories
are created in /tmp/nix* (as they should be).

But it is impossible to delete these directories without special priviliges.
The user who called guix build --keep-failed cannot delete them because they
are owned by guix-builder

Can we please either:

1. Have a command (or option to guix gc) to remove them ; OR

2. Arrange for the ownership of such directories to be changed to the calling user, 
   after the build has finished.

J'

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