these 2 derivations will be built:
  /nix/store/y9hvqh92xrp30vhpbmafsg35zg29c3hn-flake-inputs.drv
  /nix/store/ff54niq8fgc831brsxilvw8w8agsp2zb-check-flake-inputs.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy