add preferred during scheduling pod anti affinity (#2048)

* add preferred during scheduling pod anti affinity

Co-authored-by: Felix Kunde <felix-kunde@gmx.de>

charts/postgres-operator/crds/operatorconfigurations.yaml

@@ -281,6 +281,9 @@ spec:
                   pod_antiaffinity_topology_key:
                     type: string
                     default: "kubernetes.io/hostname"
+                  pod_antiaffinity_preferred_during_scheduling:
+                    type: boolean
+                    default: false
                   pod_environment_configmap:
                     type: string
                   pod_environment_secret:

charts/postgres-operator/values.yaml

@@ -167,6 +167,8 @@ configKubernetes:
   pdb_name_format: "postgres-{cluster}-pdb"
   # override topology key for pod anti affinity
   pod_antiaffinity_topology_key: "kubernetes.io/hostname"
+  # switches pod anti affinity type to `preferredDuringSchedulingIgnoredDuringExecution`
+  # pod_antiaffinity_preferred_during_scheduling: true
   # namespaced name of the ConfigMap with environment variables to populate on every pod
   # pod_environment_configmap: "default/my-custom-config"
   # name of the Secret (in cluster namespace) with environment variables to populate on every pod