these 2 derivations will be built:
  /nix/store/ppin3nqp97xqhzwsihw1s14fbnipc2gm-nixos-test-driver-pg_tle.drv
  /nix/store/ydcyw4na6bsf6jh73z7q4pawqfvspbq2-vm-test-run-pg_tle.drv