these 2 derivations will be built:
  /nix/store/4wdfq999c6kjg0r49jkwdr4j3wimgqxk-nixos-test-driver-pg_hashids.drv
  /nix/store/icg1bcns7c219apjzlydyabx2p4apkv4-vm-test-run-pg_hashids.drv