Add example setup in docker compose and tests for Pub/Sub and scheduled configurations

As discussed with @ek599, we're going to move some example local compose setups and unit testing for Pub/Sub and schedule configurations out into a separate issue - rather than as part of https://gitlab.developers.cam.ac.uk/uis/devops/iam/idhub/api/-/issues/101

Acceptance Criteria

• example or real usage deployed
  • hello world log messages are logged for pub/sub delivered message (print event)
  • hello world log messages are logged for schedule events
• increment library version and use release it to tag and release
• ensure docker images also using tag