ci: add required-ci aggregator job (#377)

* ci: add required-ci aggregator job

Adds a single "Required CI" job that depends on the test matrix and
fails if any test variant did not succeed. This lets branch protection
target one stable check name instead of every matrix combination.

* ci: make required-ci check generic across all needed jobs

Author: MarshallOfSound

.github/workflows/test.yml

@@ -41,3 +41,14 @@ jobs:
         run: yarn lint && yarn test
       - name: Build docs
         run: yarn build:docs
+
+  required-ci:
+    name: Required CI
+    if: always()
+    needs:
+      - test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check job results
+        if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
+        run: exit 1