Accessing files and CLI inside of container deployment in lightsail

Hello! I've just deployed my first container in lightsail.

I'm getting some internal errors and some services and files inside the container need configuring.

Problem is, for me to configure something and check if it works, I need to do it locally, then build the container, then push it to lightsail, which is a lengthy process.

What I want to do is, like on my local docker machine, get a CLI inside the container. That'll help configure services, as well as check the logs, but I can't seem to find a way to do that.

Is there a way to access a CLI and the files inside the container?