Build your Arch Linux packages within a Docker container.
docker pull flaccid/arch-makepkg
docker run -i -t --rm -v $(pwd):/usr/local/build/src flaccid/arch-makepkg
If you get the following:
==> ERROR: You do not have write permission to create packages in /usr/local/build/src.
Aborting...
==> ERROR: An unknown error has occurred. Exiting...
You probably have not provided a bind mount volume to this location with a PKGBUILD.