fix: corrigir tipos de servidor AMD (CPX→CX), autoscaler, stdin e cleanup

- Corrigir tipos Hetzner: CPX não existe, usar CX (Intel shared vCPU)
  - CX23 (2 vCPU, 4GB) equivalente ao CAX11
  - CX33 (4 vCPU, 8GB) equivalente ao CAX21
  - CX43 (8 vCPU, 16GB) equivalente ao CAX31
- Corrigir location no autoscaler para amd64 (nbg1→fsn1)
- Remover gitlab-pool do autoscaler (substituído pelo Gitea)
- Aumentar worker-pool max para 30
- Corrigir Floating IP e Load Balancer hardcoded em nbg1
- Corrigir stdin em read interativo: usar < /dev/tty e read -p
- Corrigir cleanup de namespace: lidar com Terminating e finalizers
- Corrigir CNPG: nome do deployment, secret e endpointURL duplo
- Aulas afetadas: 08, 09, 10, 11, 12, 14, 17

aula-17/cnpg/cluster.yaml

@@ -12,29 +12,15 @@ spec:
   #   topology.kubernetes.io/zone   = fsn1 | nbg1 | hel1  (datacenter)
   #   topology.kubernetes.io/region = eu-central | hel-southeast
   #
-  # Layer 1: podAntiAffinity on hostname (hard constraint)
-  #   → No 2 PG pods on the same node. Ever.
+  # podAntiAffinityType: required → no 2 PG pods on same node (hard constraint)
+  # topologyKey: kubernetes.io/hostname → spread across nodes
   #
-  # Layer 2: podAntiAffinity on zone (soft constraint)
-  #   → Prefer spreading across datacenters. With nodes in fsn1, nbg1, hel1,
-  #     you get 1 pod per DC. With only eu-central nodes, they still spread
-  #     across FSN and NBG (both in eu-central, ~1-2ms apart).
-  #
-  # Prerequisite for cross-region (eu-central + HEL):
-  #   - Node pool in eu-central (FSN + NBG) → aula-08
-  #   - Node pool in hel-southeast (HEL)    → add worker after aula-08
-  #   - Without HEL nodes, all 3 pods stay in eu-central (still HA within region)
+  # For cross-DC spread, CNPG relies on Kubernetes scheduler topology awareness.
+  # With nodes in multiple zones (fsn1, nbg1, hel1), the scheduler naturally
+  # spreads pods when combined with the node autoscaler.
   affinity:
     topologyKey: kubernetes.io/hostname
     podAntiAffinityType: required
-    podAntiAffinity:
-      preferredDuringSchedulingIgnoredDuringExecution:
-        - weight: 100
-          podAffinityTerm:
-            topologyKey: topology.kubernetes.io/zone
-            labelSelector:
-              matchLabels:
-                cnpg.io/cluster: shared-postgres
   storage:
     size: 10Gi
     storageClass: hcloud-volumes
@@ -60,10 +46,6 @@ spec:
     initdb:
       database: app
       owner: app
-      secret:
-        name: shared-postgres-superuser
-  superuserSecret:
-    name: shared-postgres-superuser
   backup:
     barmanObjectStore:
       destinationPath: s3://CHANGE_BUCKET_NAME/cnpg-backups/shared-postgres