зарегистрируйте содержимое файла в рабочем дереве в индекс (Register file contents in the working tree to the index)
Примечание (Note)
Users often try to use the assume-unchanged and skip-worktree
bits to tell Git to ignore changes to files that are tracked.
This does not work as expected, since Git may still check working
tree files against the index when performing certain operations.
In general, Git does not provide a way to ignore changes to
tracked files, so alternate solutions are recommended.
For example, if the file you want to change is some sort of
config file, the repository can include a sample config file that
can then be copied into the ignored name and modified. The
repository can even include a script to treat the sample file as
a template, modifying and copying it automatically.