As @courier10pt
alluded to , git's a pretty generic tool where you could keep anything there. Deciding what should go there is kind of a matter of figuring it out over time between you and your collaborators.
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Thank you for sharing! Very interesting :)
Here's a discussion on how orgs typically keep their secrets:
dev.to/ben/how-does-your-organizat...
And while it's an atypical approach, you could encrypt and check your secrets in:
dev.to/davidk01/encrypt-and-check-...
As @courier10pt alluded to , git's a pretty generic tool where you could keep anything there. Deciding what should go there is kind of a matter of figuring it out over time between you and your collaborators.