Store failures as artifacts.

.github/workflows/awesomebot.yml

@@ -16,3 +16,8 @@ jobs:
       run: gem install awesome_bot
     - name: Run Awesome Bot
       run: awesome_bot README.md --white-list igor.io,symfony,toranproxy.com,vagrantup.com,3v4l.org,voicesoftheelephpant.com,drupal.org
+    - uses: actions/upload-artifact@v1
+      if: failure()
+      with:
+        name: ab-results
+        path: ab-results-README.md.json