https://github.com/IronCoreLabs/ironhide is a tool we built for managing our own developer secrets. It allows encrypted files to be checked in to git or stored elsewhere. You can think of it similar to gpg, with the upside that ironhide has the ability to change who can decrypt the secret without re-encrypting the data.

Check it out and if you have any questions, feel free to ask here or open an issue in github. We also have a Rust version in the works for those interested in something native.