perplexity offered me those:
https://github.com/awslabs/git-secrets
https://www.infracloud.io/blogs/prevent-secret-leaks-in-repo...
https://www.reddit.com/r/git/comments/1h1r0ep/best_practices...
In addition GitGuardian cost something around $220/year per developer which is not too bad
How big is your team? GitGuardian is free for team below 25 dev. And it will make sure secrets don't make it to your code and highlight any historical leaks too.