Working with Secrets in Source Control
The best way to avoid leaking secrets is to store them in local/private files and exclude these from git tracking with a .gitignore file.
E.g. the following pattern will exclude all files with the extension .private.config:
For more details on proper management of credentials and secrets in source control, and handling an accidental commit of secrets to source control, please refer to the Secrets Management document which has further information, split by language as well.
As an extra security measure, apply credential scanning in your CI/CD pipeline.