chore: add gitea-merge-queue.yml workflow

.gitea/workflows/gitea-merge-queue.yml

@@ -0,0 +1,18 @@
+name: Merge Queue
+
+on:
+  pull_request:
+    types: [labeled]
+
+jobs:
+  merge:
+    if: contains(github.event.pull_request.labels.*.name, 'merge-queue')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Merge PR
+        run: |
+          curl -X POST \
+            -H "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
+            -H "Content-Type: application/json" \
+            "${{ github.api_url }}/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/merge" \
+            -d '{"do":"merge","merge_when_checks_succeed":true}'