these 2 derivations will be built:
  /nix/store/j82i2i1jy3745syjcf8wqq9xlfc7clhd-nixos-test-driver-pg_jsonschema.drv
  /nix/store/805bmfgw45gys5bz370ppz8mmfzwr10j-vm-test-run-pg_jsonschema.drv