replace bors with merge queue

Author: burrbull

.github/bors.toml

@@ -1,12 +1,22 @@
 on:
   push:
-    branches: [ staging, trying, master ]
+    branches: master
   pull_request:
+  merge_group:
 
 name: Continuous integration
 
 jobs:
   ci:
+    name: CI
+    runs-on: ubuntu-latest
+    needs: [check]
+    if: always()
+    steps:
+      - name: Done
+        run: jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'
+
+  check:
     runs-on: ubuntu-latest
     strategy:
       matrix: