add additional testing for older and newer versions of ruby

Author: duncaan

.github/workflows/test.yaml

@@ -9,8 +9,30 @@ on:
 
 jobs:
   test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        ruby-version: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+
+    - name: Install dependencies
+      run: bundle install --retry=3
+
+    - name: Run tests
+      run: bundle exec rspec spec/
 
+  publish:
+    needs: test
     runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
 
     steps:
     - uses: actions/checkout@v4
@@ -27,7 +49,6 @@ jobs:
       run: bundle exec rspec spec/
 
     - name: Publish to RubyGems
-      if: startsWith(github.ref, 'refs/tags/')
       run: |
         mkdir -p $HOME/.gem
         touch $HOME/.gem/credentials