these 3 derivations will be built:
  /nix/store/fry01vxia4l3a33998vkiw7ij4fqiq1s-docs-site-main-site.conf.drv
  /nix/store/wj8w73wm7qs6c1advn2sxwpdw774vjpa-docs-site-main-nginx.conf.drv
  /nix/store/00621x0k2jijw1rgj9ck61fgwfiddwc2-docs-backend-test.drv