Implement Excalidraw Helm chart to have share/collaborate feature

[locmai]

We now have the base chart at https://github.com/locmai/charts/tree/main/charts/excalidraw - a few extra steps required to have the collaboration feature:

• Follow the PoC with docker-compose here https://gitlab.open-mind.space/pandel/excalidraw-docker
• The PoC seems referencing to the work at https://github.com/NMinhNguyen/excalidraw-json which has no Dockerfile yet.
• Spin up the excalidraw-room, excalidraw-json, and Minio then route ingress accordingly.