Docker improve

Improved each Dockerfile's tools according to the Docker best practices, including change to more lightweight docker images, add label mataintainer, set to non-root user, remove cache, prefer running commands in a single layer and pin the version when needed.

https://jyvsectec.fi/2019/04/optimising-and-securing-dockerfiles/ https://blog.docker.com/2019/07/intro-guide-to-dockerfile-best-practices/