Don't commit your .DS_Store files

[axvf]

https://2dotslash.com/blog/dont-commit-your-ds-store-files

[toomanybeersies]

This seems more like a story of "don't store database backups in publicly accessible folders"

[axvf → toomanybeersies]

That's certainly the real problem here, the point is you might expect the webserver to prevent indexing but this file can act as an index.