fix(aula-08): prevenir volume stalling com CSI tolerations e PDB

- Adicionar hcloud-csi-values.yaml com tolerations para node failures
- Configurar 2 replicas do CSI controller para HA
- Criar statefulset-pdb.yaml para proteger StatefulSets durante drain
- Documentar troubleshooting de volumes stuck no README

aula-08/hcloud-csi-values.yaml

@@ -0,0 +1,13 @@
+# Configuracoes para graceful handling de node failures
+controller:
+  tolerations:
+    - key: "node.kubernetes.io/unreachable"
+      operator: "Exists"
+      effect: "NoExecute"
+      tolerationSeconds: 60
+    - key: "node.kubernetes.io/not-ready"
+      operator: "Exists"
+      effect: "NoExecute"
+      tolerationSeconds: 60
+  # Mais replicas para HA do controller
+  replicaCount: 2