these 2 derivations will be built:
  /nix/store/jnvjr2pyqzhm9r1vm32lncgnv6ik2czl-nixos-test-driver-pg_tle.drv
  /nix/store/dic9l5b1d71ycc5zrkdwxzsycnpjfwn1-vm-test-run-pg_tle.drv