misc: helm sideload initContainer option (#4325)

***NO_CI***

dev/helm/values.yaml

@@ -85,6 +85,17 @@ tolerations: []
 
 affinity: {}
 
+# This will allow us to install locales even without internet access using a initContainer & wikjs "sideloading"
+sideload:
+  enabled: false
+  # Git-Repo containing all locales.json-files you need:
+  repoURL: https://github.com/Requarks/wiki-localization
+
+  ## This can be helpfull if you have internet access over a http proxy:
+  env: []
+  #  - name: HTTPS_PROXY
+  #    value: http://my.proxy.com:3128
+
 ## Configuration values for the postgresql dependency.
 ## ref: https://github.com/kubernetes/charts/blob/master/stable/postgresql/README.md
 ##