Set up Automated Builds on Docker Hub for Zanata Server

There are 2 downsides of automated build on docker hub.

1. Cannot change the repository name. This makes the production docker image become zanata-docker-file instead of server

2. Their regex documentation is not clear.

Thus, this issue should be removed from current sprints, and only to restart when we migrate the Dockerfile to main reposotory, zanata-platform.