these 2 derivations will be built:
  /nix/store/jqs64v7xb076q0rk3mqib74bw0r8l6n9-nixos-test-driver-pg_graphql.drv
  /nix/store/qvilmxmvsgihldlpdns6akpj0zcada7r-vm-test-run-pg_graphql.drv