Get lobby running in cluster

[ajh123]

The cluster’s lobby instance should be using the lobby JAR built by https://github.com/miners-online/monorepo

Tasks to complete:

• - Build support for Shulker into the game core
• - Publish JAR files from CI/CD
• - Update lobby.yaml to point to the new custom JAR files see https://shulker.jeremylvln.fr/latest/guide/recipes/using-custom-server-jar.html

[huly-for-github]

Connected to Huly®: INFRA-1