ci: build on macos (#2)

Author: gi

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: ruby-3.0
+          ruby-version: ruby-3
           bundler-cache: true
       - name: Test
         run: bundle exec rake
@@ -38,7 +38,7 @@ jobs:
       - name: Install
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: ruby-3.0
+          ruby-version: ruby-3
           bundler-cache: true
       - name: Lint
         run: bundle exec rubocop
@@ -47,7 +47,7 @@ jobs:
     strategy:
       matrix:
         os:
-          # - macos-latest
+          - macos-latest
           - ubuntu-latest
         ruby:
           - ruby-2.6