Exclusive cleanup

[jurf]

Linux distribution and version

Silverblue F29

Flatpak-builder version

flatpak-builder 1.0.1

Description of the problem

Sometimes it’s desired to only leave some files when cleaning up. E.g. with Ghostscript, which installs a lot of tools, but the app in question only uses the main gs executable, which results in horrendous cleanups.

Having a ! notation would really help, as with .gitignore’s:

cleanup:
  - /bin
  - !/bin/gs

Or something.