feat(oauth2-proxy): Support spec.unhealthyPodEvictionPolicy field for HPA

* By using .spec.unhealthyPodEvictionPolicy, you can also define the criteria when unhealthy pods should be considered for eviction.

* Reference: https://kubernetes.io/docs/tasks/run-application/configure-pdb/\#unhealthy-pod-eviction-policy

Signed-off-by: younsl <[email protected]>

Author: younsl

helm/oauth2-proxy/templates/poddisruptionbudget.yaml

@@ -17,4 +17,7 @@ spec:
   {{- with .Values.podDisruptionBudget.minAvailable }}
   minAvailable: {{ . }}
   {{- end }}
+  {{- with .Values.podDisruptionBudget.unhealthyPodEvictionPolicy }}
+  unhealthyPodEvictionPolicy: {{ . }}
+  {{- end }}
 {{- end }}

helm/oauth2-proxy/values.yaml

@@ -311,6 +311,10 @@ podDisruptionBudget:
   enabled: true
   maxUnavailable: null
   minAvailable: 1
+  # Policy for when unhealthy pods should be considered for eviction.
+  # Valid values are "IfHealthyBudget" and "AlwaysAllow".
+  # Ref: https://kubernetes.io/docs/tasks/run-application/configure-pdb/#unhealthy-pod-eviction-policy
+  unhealthyPodEvictionPolicy: ""
 
 ## Horizontal Pod Autoscaling
 ## ref: https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/