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/setup.sh

@@ -534,6 +534,7 @@ log_info "Instalando CSI Driver via Helm..."
 
 helm upgrade --install hcloud-csi hcloud/hcloud-csi \
     -n kube-system \
+    -f "$SCRIPT_DIR/hcloud-csi-values.yaml" \
     --wait \
     --timeout 5m
 
@@ -543,6 +544,11 @@ log_success "Hetzner CSI Driver instalado!"
 log_info "Verificando StorageClass..."
 kubectl get storageclass hcloud-volumes
 
+# Configurar PDB para StatefulSets (protecao durante drain)
+log_info "Criando PodDisruptionBudget para StatefulSets..."
+kubectl apply -f "$SCRIPT_DIR/statefulset-pdb.yaml"
+log_success "PDB criado"
+
 echo ""
 
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