CI: Generate matrix dynamically

Author: bastelfreak

.github/workflows/test.yml

@@ -11,16 +11,29 @@ permissions:
   contents: read
 
 jobs:
+  rubocop_and_matrix:
+    runs-on: ubuntu-24.04
+    outputs:
+      ruby: ${{ steps.ruby.outputs.versions }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Ruby ${{ matrix.ruby }}
+        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
+
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
+    needs: rubocop_and_matrix
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - ruby: "2.7"
-          - ruby: "3.0"
-          - ruby: "3.1"
-          - ruby: "3.2"
+        ruby: ${{ fromJSON(needs.rubocop_and_matrix.outputs.ruby) }}
     steps:
       - uses: actions/checkout@v4
       - name: Install Ruby ${{ matrix.ruby }}
@@ -32,10 +45,16 @@ jobs:
         run: bundle exec rake rubocop
       - name: Build the gem
         run: gem build --strict --verbose *.gemspec
+
   tests:
+    if: always()
     needs:
+      - rubocop_and_matrix
       - test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     name: Test suite
     steps:
-      - run: echo Test suite completed
+      - name: Decide whether the needed jobs succeeded or failed
+        uses: re-actors/alls-green@release/v1
+        with:
+          jobs: ${{ toJSON(needs) }}