Check ruby/spec still passes with MSpec changes in MSpec's CI

Author: eregon

.github/workflows/ci.yml

@@ -14,3 +14,18 @@ jobs:
  ruby-version: ${{ matrix.ruby }}
  bundler-cache: true
  - run: bundle exec rspec
+
+ rubyspec:
+ name: Check ruby/spec still passes with MSpec changes
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v2
+ - uses: actions/checkout@v2
+ with:
+ repository: ruby/spec
+ path: rubyspec
+ - uses: ruby/setup-ruby@v1
+ with:
+ ruby-version: 2.7
+ bundler: none
+ - run: bin/mspec --timeout 30 rubyspec