fix: Reduce status checks in ci.yml

.github/workflows/ci.yml

@@ -63,3 +63,17 @@ jobs:
 
       - name: Run tests
         run: cargo test --verbose
+
+  # NOTE: In GitHub repository settings, the "Require status checks to pass
+  # before merging" branch protection rule ensures that commits are only merged
+  # from branches where specific status checks have passed. These checks are
+  # specified manually as a list of workflow job names. Thus we use this extra
+  # job to signal whether all CI checks have passed.
+  ci:
+    name: CI status checks
+    runs-on: ubuntu-latest
+    needs: build
+    if: always()
+    steps:
+      - name: Check whether all jobs pass
+        run: echo '${{ toJson(needs) }}' | jq -e 'all(.result == "success")'