these 3 derivations will be built:
  /nix/store/067j891dpbzsmy8xgs9s2qwk57bhj12l-docs-site-main-site.conf.drv
  /nix/store/77ndn0447f8gi1sgpp3qxggq3pxqxzhf-docs-site-main-nginx.conf.drv
  /nix/store/nwfbffmlrabwmwpmvp8b9rhqfw6k4y8k-docs-backend-test.drv