STORY-19252: Keep test matrix automatically up to date

.github/workflows/pipeline.yml

@@ -1,19 +1,32 @@
 name: Pipeline
 on: [push]
 jobs:
+  ruby-versions:
+    runs-on: ubuntu-latest
+    outputs:
+      versions: ${{ steps.versions.outputs.supported_versions }}
+    steps:
+    - id: versions
+      uses: Invoca/supported_ruby_versions_action@main
+
+  gemfiles:
+    runs-on: ubuntu-latest
+    outputs:
+      versions: ${{ steps.gemfiles.outputs.gemfiles }}
+    steps:
+    - id: gemfiles
+      uses: actions/checkout@v2
+    - run: |
+        echo "gemfiles=[$(ls -1 gemfiles/*.gemfile),Gemfile]" >> $GITHUB_ENV
+
   tests:
     name: Unit Tests
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        ruby: [3.1, 3.2, 3.3]
-        gemfile:
-        - Gemfile
-        - gemfiles/activerecord_6_0.gemfile
-        - gemfiles/activerecord_6_1.gemfile
-        - gemfiles/activerecord_7_0.gemfile
-        - gemfiles/activerecord_7_1.gemfile
+        ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
+        gemfile: ${{ fromJson(needs.gemfiles.outputs.gemfiles) }}
     env:
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
     steps:
@@ -25,6 +38,7 @@ jobs:
         bundler-cache: true
     - run: bundle exec rails db:migrate
     - run: bundle exec rake test
+
   build_success:
     if: always()
     needs: