these 3 derivations will be built:
  /nix/store/0kmyfnc4la2v9kaznzp44pvjlwwq05sm-DockerSandboxes-linux-amd64.tar.gz.drv
  /nix/store/ln9n3xpf9d3lrwras8sfn5liicgh1dxj-docker-sbx-0.49.1.drv
  /nix/store/wlbyrqyj7yw9lg3w9qwx9p5rjifkkmqd-check-docker-sbx.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy