Add jellyfin-ha container-build repo

Adds the Gitea repository that manages the Docker container build for the
jellyfin-ha (HA transcoding) Jellyfin fork.

- Create unkin/jellyfin-ha (public, squash merges, delete branch on merge)
- Protect main; require the ci/woodpecker/pr/build check and docker-team approval

config/git.unkin.net/unkin/repository/jellyfin-ha.yaml

@@ -0,0 +1,12 @@
+description: "Container build for the jellyfin-ha (HA transcoding) Jellyfin fork"
+private: false
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"
+branch_protection:
+  - rule_name: "main"
+    enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/build"
+    approval_whitelist_teams:
+      - "docker"