Assuming that the person you were working with didn't drain your wallet, there are many tools which can be used to actively monitor for commits being done on GitHub with secrets of sort.
Anyone can self host it and then add multiple GitHub Dev keys to it. Then this can be used to monitor GitHub commits being done, majority of which can be categorized as "secrets".
The first one that comes to my mind is shhgit (https://github.com/eth0izzle/shhgit)
Anyone can self host it and then add multiple GitHub Dev keys to it. Then this can be used to monitor GitHub commits being done, majority of which can be categorized as "secrets".