CI: Switch to merge queue

Author: ehuss

.github/workflows/main.yml

@@ -1,5 +1,7 @@
 name: CI
-on: [push, pull_request]
+on:
+  pull_request:
+  merge_group:
 
 env:
   MDBOOK_VERSION: 0.4.40
@@ -34,3 +36,19 @@ jobs:
         curl -sSLo linkcheck.sh \
           https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/linkcheck.sh
         sh linkcheck.sh --all edition-guide
+
+  # The success job is here to consolidate the total success/failure state of
+  # all other jobs. This job is then included in the GitHub branch protection
+  # rule which prevents merges unless all other jobs are passing. This makes
+  # it easier to manage the list of jobs via this yml file and to prevent
+  # accidentally adding new jobs without also updating the branch protections.
+  success:
+    name: Success gate
+    if: always()
+    needs:
+      - test
+    runs-on: ubuntu-latest
+    steps:
+      - run: jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'
+      - name: Done
+        run: exit 0