CI push docker image: OOM

[mhubii]

The GitHub Action runner fails due to memory limits.

Possible solutions:

• Change caching https://docs.docker.com/build/ci/github-actions/cache/
• Reduce Docker image footprint (installing torch alone takes up ~4GB -> different base image?)

Related to #92.

Container could be simplified once ROS dependency is gone #100.

1. Update Docker images to remove ROS:

roboreg/.docker/Dockerfile

Line 17 in 3330220

RUN apt-get update \

2. Update README and remove ROS:

roboreg/README.md

Line 97 in 3330220

--build-arg ROS_DISTRO=jazzy \