How do you share private keys for signing e.g. JWTs inside Docker-Containers?

I’ve written an application in NodeJS which essentially only performs a login:
You send your username/password, and you retrieve an JWT (JSON Web Token).
Those tokens are being signed by a private key. Using HMAC, these tokens can be verif… Continue reading How do you share private keys for signing e.g. JWTs inside Docker-Containers?