these 2 derivations will be built:
  /nix/store/ppp7pp0nsf9c3srihf878jwd72wg1yg9-nixos-test-driver-pg_graphql.drv
  /nix/store/bk51wiqkbkk4l42jgyq1faxwaqran5r9-vm-test-run-pg_graphql.drv