add file as base then ignore it - git add will not discover it

git-ignore.log

# push base of file
git add file_name/folder_name
git commit -m "added base for the file/folder"
git push origin feature/branch


#ignore the file 
cat .gitignore
/file_name

# git update index to assume unchanged
git update-index --assume-unchanged file_name


# EXAMPLE
~/P/v/Movies-Sample-ios (feature/setup-script ⚡↩) git status
On branch feature/setup-script
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   .apple-cred
	modified:   .gitignore

~/P/v/Movies-Sample-ios (feature/setup-script ⚡↩) git update-index --assume-unchanged .apple-cred
~/P/v/Movies-Sample-ios (feature/setup-script ⚡↩) git status
On branch feature/setup-script
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   .gitignore