Add OCI annotations that is what ghcr.io registry uses

In theory they are only needed at index (individual multi-arch)
level, but setting them also @ manifest level, in case other
registry uses them there.

Keeping the labels with the same information so they can be
viewed with inspect and other tools.

Author: stronk7

.github/workflows/docker-build-and-publish.yml

@@ -8,13 +8,13 @@ on:
       - 'v*'
 
 env:
-  GITHUB_OWNER: 'stronk7'
+  GITHUB_OWNER: 'moodlehq'
   REPOSITORY: 'wiki-rag'
 
 jobs:
   Build-and-Publish:
     # Completely avoid forks and pull requests to try this job.
-    if: github.repository_owner == 'stronk7' && contains(fromJson('["push"]'), github.event_name)
+    if: github.repository_owner == 'moodlehq' && contains(fromJson('["push"]'), github.event_name)
     runs-on: ubuntu-latest
     steps:
       - name: Checkout