these 2 derivations will be built:
  /nix/store/scpafx2k29r0ygqgkbnpl3ba4n3b4gky-nixos-test-driver-pgmq.drv
  /nix/store/fwsa3gb77r22zfawmy52dj89kc4c13w0-vm-test-run-pgmq.drv