these 2 derivations will be built:
  /nix/store/qx8cgq0i7nsq46sbi6w1ldkybs0pdad7-nixos-test-driver-pgmq.drv
  /nix/store/w1nr7l97nnjnm4b31sy66n1f2xh1qd0j-vm-test-run-pgmq.drv