📝 Add external link: Serve a machine learning model using Sklearn, FastAPI and Docker (#2974)

Co-authored-by: rodrigoarenas456 <31422766+rodrigoarenas456@users.noreply.github.com>
Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

docs/en/data/external_links.yml

@@ -1,5 +1,9 @@
 articles:
   english:
+  - author: Rodrigo Arenas
+    author_link: https://rodrigo-arenas.medium.com/
+    link: https://medium.com/analytics-vidhya/serve-a-machine-learning-model-using-sklearn-fastapi-and-docker-85aabf96729b
+    title: "Serve a machine learning model using Sklearn, FastAPI and Docker"
   - author: Navule Pavan Kumar Rao
     author_link: https://www.linkedin.com/in/navule/
     link: https://www.tutlinks.com/deploy-fastapi-on-ubuntu-gunicorn-caddy-2/