ci: add final target for branch protection

Author: ctron

.github/workflows/ci.yaml

@@ -86,3 +86,17 @@ jobs:
 
       - name: Test
         run: cargo +${{ matrix.rust }} test --workspace ${{ matrix.args }} -- --nocapture
+
+  ci:
+    runs-on: ubuntu-latest
+    needs:
+      - fmt
+      - test
+    if: always()
+    steps:
+      - name: Success
+        if: ${{ !(contains(needs.*.result, 'failure')) }}
+        run: exit 0
+      - name: Failure
+        if: ${{ contains(needs.*.result, 'failure') }}
+        run: exit 1