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.