these 3 derivations will be built:
  /nix/store/5r4dw6xpq397l4m9j5hhcgyg3gwclh48-docs-site-main-site.conf.drv
  /nix/store/xzj73y3d6xg8s0g707a1y1z440hhsnkh-docs-site-main-nginx.conf.drv
  /nix/store/5ms8jza88yxprc45446drsqijhxs1qpd-docs-backend-test.drv