Init Helm chart (#255)

* Initial chart version

* Add CI/CD for chart

* Fix admin creds template

* Add command, args, env, envFrom

* Render volumes and volumeMounts with tpl

* Change persistance accessMode type

* Add update strategy config

* Use custom types in docs

* Add startup probe config

* Fix web.external_url config

deploy/helm/templates/extras.yaml

@@ -0,0 +1,4 @@
+{{- range .Values.extraDeploy -}}
+{{- tpl (toYaml .) $ }}
+---
+{{- end -}}