these 3 derivations will be built:
  /nix/store/ds9ym7a62zcabhs95mgv7z20f22s2s8m-docs-site-main-site.conf.drv
  /nix/store/h2nk4mz3mb6hk7fp6i6gs7fg7fs63s2i-docs-site-main-nginx.conf.drv
  /nix/store/hswpgy9qg7rvjh7fch3wsxi07y8axaxz-docs-backend-test.drv