CI: Switch to merge queue

.github/workflows/main.yml

@@ -1,12 +1,17 @@
 name: CI
-on: [push, pull_request]
+on:
+  pull_request:
+  merge_group:
+
+env:
+  MDBOOK_VERSION: 0.4.40
 
 jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Update rustup
       run: rustup self update
     - name: Install Rust
@@ -15,11 +20,9 @@ jobs:
         rustup toolchain install nightly -c rust-docs
         rustup default nightly
     - name: Install mdbook
-      env:
-        MDBOOK_VER: v0.4.3
       run: |
         mkdir bin
-        curl -sSL https://github.com/rust-lang/mdBook/releases/download/${{ env.MDBOOK_VER }}/mdbook-${{ env.MDBOOK_VER }}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
+        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
         echo "$(pwd)/bin" >> $GITHUB_PATH
     - name: Report versions
       run: |
@@ -33,3 +36,19 @@ jobs:
         curl -sSLo linkcheck.sh \
           https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/linkcheck.sh
         sh linkcheck.sh --all nomicon
+
+  # The success job is here to consolidate the total success/failure state of
+  # all other jobs. This job is then included in the GitHub branch protection
+  # rule which prevents merges unless all other jobs are passing. This makes
+  # it easier to manage the list of jobs via this yml file and to prevent
+  # accidentally adding new jobs without also updating the branch protections.
+  success:
+    name: Success gate
+    if: always()
+    needs:
+      - test
+    runs-on: ubuntu-latest
+    steps:
+      - run: jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'
+      - name: Done
+        run: exit 0