Adds a matrix of ruby versions to run tests against

Signed-off-by: M. Scott Ford <[email protected]>

Author: mscottford

.github/workflows/ruby.yml

@@ -1,20 +1,31 @@
-name: Ruby CI
+name: Ruby
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
+    name: Ruby ${{ matrix.ruby }}
+    strategy:
+      matrix:
+        ruby:
+          - '3.2.2'
+          - '3.1.4'
+          - '3.0.6'
+          - '2.7.7'
+          - '2.6.6'
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Ruby 2.6
+    - name: Set up Ruby ${{ matrix.ruby }}
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '2.6'
-    - name: Build and test with Rake
-      run: |
-        gem install bundler
-        bundle install --jobs 4 --retry 3
-        bundle exec rake
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+    - name: Run the default task
+      run: bundle exec rake