these 2 derivations will be built:
  /nix/store/nwlxvr51wsy1n97lr29ynzqb32psry5r-nixos-test-driver-wal2json.drv
  /nix/store/vgvm7v8p0kk1yg419vfdfwvjzv3clag2-vm-test-run-wal2json.drv