generalise Dockerfile and add actions

[alintulu]

• Add support for ALICE, ATLAS and LHCb to the docker image.
• Add github actions to build and push image to docker hub.
  • Pipeline starts only if Dockerfile is modified
  • Tags image as latest and with SHA

For actions to work you need to set two variables in GitHub secrets

DOCKER_USERNAME

Username of dockerhub: reanahub

DOCKER_PASSWORD

Password to user

Closes #2