these 2 derivations will be built:
  /nix/store/xyzp0l8m1rddai04lx35aqs9497sh1iz-nixos-test-driver-pg_jsonschema.drv
  /nix/store/m2v218aiabqp9vclfh9axm5fifv91cxf-vm-test-run-pg_jsonschema.drv