feat(postgres): Add pod and node affinity

ref: #18

Author: jon-nfc

manifests/postgres/base/Cluster.yaml

@@ -13,17 +13,29 @@ spec:
   affinity:
     additionalPodAntiAffinity:
       preferredDuringSchedulingIgnoredDuringExecution:
-        - weight: 50
+        - weight: 100
           podAffinityTerm:
             labelSelector:
               matchExpressions:
-                - key: kubernetes.io/hostname
-                  operator: Exists
+                - key: app.kubernetes.io/name
+                  operator: In
+                  values:
+                    - postgres
             topologyKey: kubernetes.io/hostname
 
     enablePodAntiAffinity: true
     nodeAffinity:
       preferredDuringSchedulingIgnoredDuringExecution:
+        - weight: 100
+          preference:
+            matchExpressions:
+              - key: node-role.kubernetes.io/control-plane
+                operator: Exists
+        - weight: 50
+          preference:
+            matchExpressions:
+              - key: node-role.kubernetes.io/master
+                operator: Exists
         - weight: 100
           preference:
             matchExpressions:

manifests/postgres/components/ha/Cluster-main-02.yaml

@@ -9,20 +9,33 @@ metadata:
     app.kubernetes.io/part-of: production-ha
   name: main-02
 spec:
+
   affinity:
     additionalPodAntiAffinity:
       preferredDuringSchedulingIgnoredDuringExecution:
-        - weight: 50
+        - weight: 100
           podAffinityTerm:
             labelSelector:
               matchExpressions:
-                - key: kubernetes.io/hostname
-                  operator: Exists
+                - key: app.kubernetes.io/name
+                  operator: In
+                  values:
+                    - postgres
             topologyKey: kubernetes.io/hostname
 
     enablePodAntiAffinity: true
     nodeAffinity:
       preferredDuringSchedulingIgnoredDuringExecution:
+        - weight: 100
+          preference:
+            matchExpressions:
+              - key: node-role.kubernetes.io/control-plane
+                operator: Exists
+        - weight: 50
+          preference:
+            matchExpressions:
+              - key: node-role.kubernetes.io/master
+                operator: Exists
         - weight: 100
           preference:
             matchExpressions:

manifests/postgres/components/ha/kustomization.yaml

@@ -37,6 +37,20 @@ patches:
   # yamllint disable rule:indentation
   - patch: |-
 
+      - op: add
+        path: /spec/affinity/additionalPodAntiAffinity/preferredDuringSchedulingIgnoredDuringExecution/0
+        value:
+          weight: 100
+          podAffinityTerm:
+            labelSelector:
+              matchExpressions:
+                - key: app.kubernetes.io/part-of
+                  operator: In
+                  values:
+                    - production-ha
+            topologyKey: kubernetes.io/hostname
+
+
       - op: replace
         path: /spec/externalClusters
         value: