ci.yml in jekyll-indico-0.6.1

- old
+ new

@@ -5,18 +5,27 @@
   pull_request:
   push:
     branches:
       - main
 
+concurrency:
+  group: test-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [2.6, 3.1]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - uses: ruby/setup-ruby@v1
       with:
+        ruby-version: ${{ matrix.ruby }}
         bundler-cache: true
 
     - name: Style checking
       run: bundle exec rake rubocop
 