[Feature Request] Support AURDEST environment variable.
Multiple AUR helpers, including yay, aurutils, paru and pacaur, have support for the AURDEST
variable, which allows the user to specify an AUR build directory that is shared between all tools. If Pamac were to adopt this standard, it would allow the user to (almost) seamlessly switch between the Pamac GUI and each one of the CLI tools above for managing AUR packages.