Add ability to set the deployment strategy

The default strategy is `RollingUpdate` which does not work well with
volume claims: they cannot be attached to the new contained, blocking
it from starting up. This commit allows the user to override this
strategy if needed.

chart/bitwarden-k8s/templates/deployment.yaml

@@ -15,6 +15,8 @@ metadata:
  app.kubernetes.io/managed-by: {{ .Release.Service }}
 spec:
  replicas: {{ .Values.replicaCount }}
+ strategy:
+ type: {{ .Values.deployStrategy }}
  selector:
  matchLabels:
  app.kubernetes.io/name: {{ include "bitwarden-k8s.name" . }}

chart/bitwarden-k8s/values.yaml

@@ -3,6 +3,7 @@
 # Declare variables to be passed into your templates.
 
 replicaCount: 1
+deployStrategy: RollingUpdate
 
 image:
  repository: bitwardenrs/server