these 2 derivations will be built:
  /nix/store/d5ymsxbfbslmqdh8kbbih4cvdjn9rfyv-nixos-test-driver-pgrouting.drv
  /nix/store/ah0a9bcfsmkxdjzh64qdky9fhv5mxy45-vm-test-run-pgrouting.drv