feat(k8s): add PodDisruptionBudget for schemas service

Create a PodDisruptionBudget to ensure minimum availability of the 
schemas service during voluntary disruptions. This enhances the 
service's resilience and ensures high availability.

k8s/pdb-prod.yaml

@@ -0,0 +1,9 @@
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: schemas-pdb
+spec:
+  minAvailable: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: schemas