these 2 derivations will be built:
  /nix/store/cp59k798918jjfkpg9mmp634b7jgj14i-nixos-test-driver-pg_graphql.drv
  /nix/store/nwrjhd456mxps5yha56n591ynkfcxmzh-vm-test-run-pg_graphql.drv