You could solve the problem with containers, but then you've re-implemented the same problem. You could have an authentication microservice that other services

You could solve the problem with containers, but then you've re-implemented the same problem. You could have an authentication microservice that other services use that way authentication is handled in one place. If there is a security issue with the code in authentication, updating the one container fixes the whole system. But doing this has the same problem. You've just re-implemented DLL hell as container hell.