repository: require CI status check on jellyfin-ha-src main

Why: the jellyfin-ha-src main branch is protected but merges are not gated
on CI, so a pull request can be merged while its Woodpecker build is red.

How: add the ci/woodpecker/pr/ci context to the main branch protection
rule. The gitea provider computes enable_status_check from a non-empty
context list, so this turns required status checks on and blocks merge
until that exact check passes.

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

@@ -5,5 +5,7 @@ default_delete_branch_after_merge: true
 branch_protection:
   - rule_name: "main"
     enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/ci"
     approval_whitelist_teams:
       - "Owners"