VS 2017 Git Local Commit DB.lock error on every commit

Just add the .vs folder to the .gitignore file.

Here is the template for Visual Studio from GitHub’s collection of .gitignore templates, as an example:
https://github.com/github/gitignore/blob/master/VisualStudio.gitignore

If you have any trouble adding the .gitignore file, just follow these steps:

1. On the Team Explorer’s window, go to Settings.

2. Then access Repository Settings.

3. Finally, click Add in the Ignore File section.

Done. 😉
This default file already includes the .vs folder.