add network policy option for gitlab

Summary

• Add network policy toggle for gitlab
• update release tag for gitlab package

Various changes to Gitlab Package:

• network polices
• limit default user permissions
• add helm tests for CI pipelines
• remove unneeded registry.host key in values.yaml
• documentation about backing up the gitlab-rails secret
• ironbank image for praefect

Closes #438
Closes #456 (closed)

chart/templates/gitlab/values.yaml

@@ -8,6 +8,9 @@ hostname: {{ .Values.hostname }}
 istio:
   enabled: {{ .Values.istio.enabled }}
 
+networkPolicies:
+  enabled: {{ .Values.networkPolicies.enabled }}
+  
 {{- if .Values.addons.gitlab.database.host }}
 postgresql:
   install: false