fix(deployment): Bind pod on master db node

manifests/deployment.yaml

@@ -13,6 +13,20 @@ spec:
             labels:
                 app: dawarich
         spec:
+            affinity:
+              podAffinity:
+                requiredDuringSchedulingIgnoredDuringExection:
+                  - labelSelector:
+                      matchExpressions:
+                        - key: cnpg.io/cluster
+                          operator: In
+                          values:
+                            - dawarich-db
+                        - key: cnpg.io/instanceRole
+                          operator: In
+                          values:
+                            - primary
+                    topologyKey: "kubernetes.io/hostname"
             containers:
               - name: dawarich
                 image: freikin/dawarich:0.26.3