Adds a verify to ensure builds have run

Author: thompson-tomo

.github/workflows/ci-build-ruby.yml

@@ -108,3 +108,37 @@ jobs:
           # 📦 Build Gem 📦
           bundle exec rake build
         working-directory: "${{ steps.setup.outputs.gem_dir || '' }}"
+
+  verify:
+    runs-on: ubuntu-24.04
+    needs:
+      - analyze
+      - build
+    if: ${{ always() }} # Always run so we can detect failures/skips
+    steps:
+      - name: Check that at least one gem was selected
+        run: |
+          if [ "${{ needs.analyze.outputs.gems }}" = "[]" ]; then
+            echo "❌ No gems selected — build matrix was empty."
+            exit 1
+          fi
+          gems='${{ needs.analyze.outputs.gems }}'
+          count=$(echo "$gems" | jq 'length')
+          echo "ℹ️ Build count: $count"
+
+      - name: Check that build job actually ran
+        run: |
+          if [ "${{ needs.build.result }}" = "skipped" ]; then
+            echo "❌ Build job was skipped — no builds executed."
+            exit 1
+          fi
+
+      - name: Check that all builds passed
+        run: |
+          if [ "${{ needs.build.result }}" != "success" ]; then
+            echo "❌ One or more builds failed."
+            exit 1
+          fi
+
+      - name: All checks passed
+        run: echo "✅ All builds ran and passed."