these 4 derivations will be built:
  /nix/store/lbn13yxkm7xasi16j8yq96gr3f8l1y58-run-nixos-vm.drv
  /nix/store/c9h80k4abaznxfz5alappklfnla9dhr6-nixos-vm.drv
  /nix/store/j5ji5pmkpwxjvlwfz4n4kxyn77vlwhzm-nixos-test-driver-wrappers-regression-PSQL-1387.drv
  /nix/store/2i45hg1kgi5nsvbi9isrfmp92v5zaprf-vm-test-run-wrappers-regression-PSQL-1387.drv