Licenses are usually on a per-user basis, even on the same machine. I will admit some level of ignorance to containers, but from what little I know they are basically mimicking an entire different computer. As such I doubt ReadyAPI on the container can see the license on your machine. It would likely need its own license, or the container would have to run as the same user who the license was installed under in the first place.
Looking at the licensing page/FAQ, a fixed license and a container might not be a viable solution.
https://smartbear.com/blog/how-to-navigate-readyapi-licensing/