create an script which precaches updates reading the installed packages and pin updates for them

[RubenKelevra]

write a script which runs as a service under the user ipfs

The script should lookout for new versions of installed software and pin them locally, to avoid that updates need to be downloaded while updated

difficulties:

~~The pkgs are all in one folder, we need to separate between unstable and stable packages - how?~~ see https://github.com/RubenKelevra/pacman.store/issues/11