Follow Arch packaging guidelines for AUR pkgbuild

[FabioLolix]

Follow up to my comment https://aur.archlinux.org/packages/exoscale-cli/#comment-822237

Attached there are 3 pkgbuilds: exoscale-cli (from source), exoscale-cli-bin and exoscale-cli-git ready to go

exoscale-cli-pkgbuilds.tar.gz

[falzm]

@pyr an opinion on this?

[pyr]

Hi @FabioLolix , the package builds look good. We will transition over to this scheme over the coming weeks, thanks!

[sauterp]

Thank you very much for your contribution @FabioLolix we were able to implement all 3 packages based on it. You are of course acknowledged with a #Contributor line in all the PKGBUILD files.