MSC3231: https://github.com/matrix-org/matrix-doc/pull/3231

Use attached image
Fix changes key
Missing stage
Fix tags for ci builds
Make lint
Use branch pipelines
Fix changes rule
Fix needs
Exit success after docker build
Try to fix postgres lockfile
Whitelist var run in container build
Make tests homeserver name generic

Continue fixing ClientAPI tests; Rearranged nesting order since the PUT wasn't working when nested in the join_room. TODO: figure out why the room is not added to directory

This fixes an issue, where clients may think none is typing, because a different event type arrived

(Draft) Tests for validating request & response payloads and verifying proper backend functionality for viewing public rooms directory