this derivation will be built:
  /nix/store/i9jfzf4q3aas9gynskfa5zai0ymg86c8-treefmt-check.drv
error: Cannot build '/nix/store/i9jfzf4q3aas9gynskfa5zai0ymg86c8-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/p6k0whd99kxc4fbjviy08namfnv9jwd7-treefmt-check
       Last 25 log lines:
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/db.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/fetch.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/i18n.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/mail.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/model.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/render.py:1:1
       >
       > Found 16 errors (1 fixed, 15 remaining).
       >
       > traversed 200 files
       > emitted 115 files for processing
       > formatted 18 files (1 changed) in 4.266s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/i9jfzf4q3aas9gynskfa5zai0ymg86c8-treefmt-check.drv