Add new deployment with dogs

Signed-off-by: Arnaud M <arnaud.choupinette@mailops.fr>

kubernetes/training/lessons/2-cat-dog.md

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+# Kubernetes Cats and Dogs
+
+## The dog api
+
+Behind demo-flask, we are using thecatapi.com
+The same API also exist for dogs: thedogapi.com
+
+## Exo
+
+What you need to do now is to create a new deployment that will use the dog api.
+
+At the end, when browsing the website, I want to see half of the time a dog, half of the time a cat.
+
+Try to figure out how to achieve this.
+
+Some clues:
+- you may need to use configmap and volumes to change start.py
+- you may need to create two deployments (one for cats, one for dogs)
+- you may need to use the same labels for both deployments so the service will loadbalance between the two of them
+
+## Bonus
+
+Add some HTTPS certificates using letsencrypt (maybe using certmanager)