Feature Request: --apply option for nix build command

[SharzyL]

Currently nix eval accepts --apply option, which applies a function to the specified installable. However, nix build has no such option, causing inconsistency and confusions. nix build --apply is especially useful when trying to build an overrided package.

$ nix eval nixpkgs#git --apply 'p: (p.override { guiSupport = false; }).outPath'
"/nix/store/0l63mqr7qx1asjxfz86j4zbs4758gn98-git-2.46.0"

$ nix build nixpkgs#git --apply 'p: p.override { guiSupport = false; }'
error: unrecognised flag '--apply'
Try 'nix --help' for more information.