these 3 derivations will be built:
  /nix/store/l66wwx74gqngfrxf70g7gf7lw7v9spm2-hm_gitconfig.drv
  /nix/store/z5ci0dha654fdlvba3izmji5ngx61j9m-home-manager-files.drv
  /nix/store/s4xfqgv6mi5d9yhyz1myb3sp3dy4wl9p-home-manager-generation.drv