these 3 derivations will be built:
  /nix/store/7qwgzw9cvn4ac6xwzajkjzcs4dw4m7lv-source.drv
  /nix/store/019bgkn6ij1yxjdarxpf2dx14vrnidf0-treehouse-2.1.1-go-modules.drv
  /nix/store/akw04sfxnj7x5c62z50anbqc8gvddwxz-treehouse-2.1.1.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy