these 2 derivations will be built:
  /nix/store/nsh6f8m3rpviqpvqmdknl1k2n4bxrnc0-nixos-test-driver-pg_tle.drv
  /nix/store/hafasnkkixs6rzzrqcvzj9011vgma71q-vm-test-run-pg_tle.drv