ci: install jq in sop-tier-check runner

Gitea Actions runners (ubuntu-latest) do not bundle jq.
The sop-tier-check script uses jq for all JSON API parsing
(org_helpers, label parsing, team resolution, review parsing).
Install jq before the script runs so sop-tier-check can pass
without relying on a runner pre-cached jq binary.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/sop-tier-check.yml

@@ -77,6 +77,12 @@ jobs:
           # works if we never check out PR HEAD. Same SHA the workflow
           # itself was loaded from.
           ref: ${{ github.event.pull_request.base.sha }}
+      - name: Install jq
+        # Gitea Actions runners (ubuntu-latest label) do not bundle jq.
+        # The script uses jq extensively for all JSON parsing; install it
+        # before the script runs. Using -qq for quiet output.
+        run: apt-get update -qq && apt-get install -y -qq jq
+
       - name: Verify tier label + reviewer team membership
         env:
           # SOP_TIER_CHECK_TOKEN is the org-level secret for the