When you’re deploying code, you often want the files you have checked out of git to be executable. For example, if you have a script for automation, you want to be able to do ./script rather than “bash script” or “python script”. That way the #! line takes care of doing the right thing.
You can actually make a file “executable” in git by doing this command before your push:
git update-index --chmod=+x somefile.sh