➕ Add dmuc exercise

slides/exercises/dmuc-brief.md

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+## Exercise — Build a Cluster
+
+- Deploy a cluster by configuring and running each component manually
+
+- Add CNI networking
+
+- Generate and validate ServiceAccount tokens

slides/exercises/dmuc-details.md

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+# Exercise — Build a Cluster
+
+- Step 1: deploy a cluster
+
+  - follow the steps in the "Dessine-moi un cluster" section
+
+- Step 2: add CNI networking
+
+  - une kube-router
+
+  - interconnect with the route-reflector
+
+  - check that you receive the routes of other clusters
+
+- Step 3: generate and validate ServiceAccount tokens
+
+  - see next slide for help!
+
+---
+
+## ServiceAccount tokens
+
+- We need to generate a TLS key pair and certificate
+
+- A self-signed key will work
+
+- We don't need anything particular in the certificate
+
+  (no particular CN, key use flags, etc.)
+
+- The key needs to be passed to both API server and controller manager
+
+- Check that ServiceAccount tokens are generated correctly