.gitignore an already committed folder

I accidentially committed a folder that is generated during each build automatically. It's not necessary to have that folder under git control. To not have that folder tracked in the future anymore the following process can be applied:

1. Commit the uncommitted changes in the repo
2. Edit .gitignore to ignore the folder
3. Issue the following three git commands

git rm -r --cached .
git add .
git commit -m "Have working .gitignore"

The solution was described by Théo Attali on stackoverflow in 2017.The git-rm documentation explains the used options:

-r

Allow recursive removal when a leading directory name is given.

-- cached

Use this option to unstage and remove paths only from the index. Working tree files, whether modified or not, will be left alone.

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