Another alternative: https://github.com/tellerops/teller

It's a standalone tool with YAML configuration, simple to use.

Basically the way it works:

- You create the secret in GCP/AWS/etc Secrets Manager service, and put the secret data there.

- Refer to the secret by its name in Teller.

- Whenever you run `$ teller run ...` it fetches the data from the remote service, and makes it available to your process.