these 2 derivations will be built:
  /nix/store/s7q747bzl32r7hkjf0gyxq3mcz5irczr-nixos-test-driver-pg_tle.drv
  /nix/store/adsckip17y2kb5fvsjiydyr2bjz5xpj3-vm-test-run-pg_tle.drv