GitHub Actions improvements

.github/workflows/specs.yml

@@ -17,10 +17,19 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
-          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+          bundler-cache: true
+
       - name: Run tests
         run: bundle exec rake
+
+      - name: Archive screenshots for failed tests
+        uses: actions/upload-artifact@v2
+        if: failure()
+        with:
+          name: test-failed-screenshots
+          path: spec/dummy/tmp/screenshots