CI: Generate ruby matrix dynamically

Author: bastelfreak

.github/workflows/unit_tests.yaml

@@ -17,16 +17,29 @@ env:
   CI: true
 
 jobs:
+  matrix:
+    runs-on: ubuntu-24.04
+    outputs:
+      ruby: ${{ steps.ruby.outputs.versions }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Ruby 3.4
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.4'
+          bundler-cache: true
+      #- name: Run RuboCop
+      #  run: bundle exec rake rubocop
+      - id: ruby
+        uses: voxpupuli/ruby-version@v1
+
   linux_unit_tests:
+    needs: matrix
     name: Ruby version
     strategy:
       fail-fast: false
       matrix:
-        ruby:
-          - '2.7'
-          - '3.0'
-          - '3.2'
-          - '3.3'
+        ruby: ${{ fromJSON(needs.matrix.outputs.ruby) }}
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout current PR