these 3 derivations will be built:
  /nix/store/bcwr15nyp20id0h8vnlxirj6d57wl48f-Caddyfile.drv
  /nix/store/hx14f3mbyp332an34553c6xj8x31kx3b-Caddyfile-formatted.drv
  /nix/store/i5kvsxiypcyvxj3d25q3zxhxphp466j7-james-caddy-source-test.drv