Merge branch 'turn-off-image-digest' into 'master'

Image digest policy off by default

Closes #780

See merge request platform-one/big-bang/bigbang!989

chart/templates/gatekeeper/values.yaml

@@ -75,6 +75,9 @@ violations:  # Try to keep this in alpha order to make it easier to find keys
         - mattermost/mattermost
   {{- end }}
 
+  imageDigest:
+    enabled: false
+
   namespacesHaveIstio:
     enabled: {{ .Values.istio.enabled }}