[stable/nats] Change regex looking for rolling tags (#14275)

Signed-off-by: Carlos Rodriguez Hernandez <crhernandez@bitnami.com>

stable/nats/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: nats
-version: 2.5.2
+version: 2.5.3
 appVersion: 1.4.1
 description: An open-source, cloud-native messaging system
 keywords:

stable/nats/templates/NOTES.txt

@@ -90,7 +90,7 @@ To access the Monitoring svc from outside the cluster, follow the steps below:
 
 {{- include "nats.validateValues" . -}}
 
-{{- if and (contains "bitnami/" .Values.image.repository) (not (.Values.image.tag | regexFind "-r\\d+$")) }}
+{{- if and (contains "bitnami/" .Values.image.repository) (not (.Values.image.tag | toString | regexFind "-r\\d+$|sha256:")) }}
 
 WARNING: Rolling tag detected ({{ .Values.image.repository }}:{{ .Values.image.tag }}), please note that it is strongly recommended to avoid using rolling tags in a production environment.
 +info https://docs.bitnami.com/containers/how-to/understand-rolling-tags-containers/