these 2 derivations will be built:
  /nix/store/9wyk8l49ypwxk1xvafd9lp7bc95jv13i-nixos-test-driver-pg_hashids.drv
  /nix/store/fcawn9m0n7k5jmap1q6cjv6xc14mbfs4-vm-test-run-pg_hashids.drv