feat: add topology spread (#39)

Author: davex98

templates/deployment.yaml

@@ -149,3 +149,7 @@ spec:
           {{- end }}
         {{- end }}
       {{- end }}
+      {{- with .Values.topologySpreadConstraints }}
+      topologySpreadConstraints:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}

values.yaml

@@ -143,6 +143,16 @@ affinity: {}
   #           - pgdog
   #       topologyKey: kubernetes.io/hostname
 
+# topologySpreadConstraints controls how pods are spread across topology domains
+# https://kubernetes.io/docs/concepts/scheduling-eviction/topology-spread-constraints/
+topologySpreadConstraints: []
+  # - maxSkew: 1
+  #   topologyKey: topology.kubernetes.io/zone
+  #   whenUnsatisfiable: DoNotSchedule
+  #   labelSelector:
+  #     matchLabels:
+  #       app: pgdog
+
 # podAntiAffinity enables default anti-affinity rules to spread pods
 # across nodes
 # Set to true for automatic pod anti-affinity configuration