avoid multiple executions of makepkg for the same PKGBUILD

[linuxmetel]

Is your feature request related to a problem? Please describe.

I wanted to install some themes for GRUB, so I tried installing packages in grub-themes-git from AUR.

$ yay -S `cat grub-themes-git-package-list`

However, this command seems to do like this for the 57 package (I translated from Japanese so there may be different from the original version):

==> Making package: grub-themes-git 2022.10.30.r35.g000171d-1 (09/01/2024 01:03:04)
==> Checking the runtime's dependencies...
==> Checking the dependencies in the building time...
==> Retrieving the source...
  -> Syncing grub2-themes git repo...
==> Validating sources file with sha256sums...
    grub2-themes ... skipped
==> Deleting the existing $srcdir/ directory...
==> Expanding the source...
  -> Copying grub2-themes git for building...
Cloning into 'grub2-themes'...
done.
==> Starting pkgver()...
==> Prepared the source
 -> grub-themes-git-2022.10.30.r35.g000171d-1 has already existed -- Skipping to build

Each process took a lot, and the sum reached hours on my machine.

Describe the solution you'd like

I think that yay command should skip preparing and building process for the packages whose PKGBUILD has been executed (in the same yay command's execution). In other words, I think that one PKGBUILD should be executed just once in single yay command's execution.

And also it may be a radical solution to implement the functionality for installing by pkgbase.