these 2 derivations will be built:
  /nix/store/nlfraxd8qmq4lg0adnpvhk7n1z80ikc7-nixos-test-driver-pg_tle.drv
  /nix/store/pzijwfwgrh0bh3hla4whxwpw3i1pyvz3-vm-test-run-pg_tle.drv