Auto publish docker images to dockerhub

[mmcauliffe]

• Set up MontrealCorpusTools dockerhub account on https://hub.docker.com/
• Migrate files in https://github.com/MontrealCorpusTools/polyglotdb-docker to this repo
• See MFA's dockerfile: https://github.com/MontrealCorpusTools/Montreal-Forced-Aligner/blob/main/Dockerfile and docker conda environment: https://github.com/MontrealCorpusTools/Montreal-Forced-Aligner/blob/main/ci/docker_environment.yaml
• Add Github action workflow for auto publishing images (ref: https://github.com/MontrealCorpusTools/Montreal-Forced-Aligner/blob/main/.github/workflows/publish_docker.yml)