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Developer posts secret key on GitHub, loses $40K in 2 minutes
(cointelegraph.com)
This is a most excellent place for technology news and articles.
For personal projects that's definitely a good idea. For team projects I like to keep that stuff in the project still so the "experience" of working in the project is mostly consistent.
I started using git-secret 2 years ago. It's nice for making secrets part of the repo, while not being readable by anyone that isn't explicitely allowed to do so (using GPG).