DockerHub push

[aurelf]

A new PR based on DockerHub push #165

• Test pushing to DockerHub
• mention dockerhub and test action
• Only if all tests pass, go to dockerhub
• You already checking if the Docker image can build completely before pushing so I am just removing this
• Pushing to DockerHub works. Think best I leave it to anyone forking to make the DockerHub account and secrets to avoid double building the Docker image
• Add docker push workflow as separate