Coder: Helm chart and configuration

Change-Id: I43515c289001bf1407aee1f9734151a261a7808a
diff --git a/charts/coder/templates/extra-templates.yaml b/charts/coder/templates/extra-templates.yaml
new file mode 100644
index 0000000..e047658
--- /dev/null
+++ b/charts/coder/templates/extra-templates.yaml
@@ -0,0 +1,4 @@
+{{- range .Values.extraTemplates }}
+---
+{{ include "coder.renderTemplate" (dict "value" . "context" $) }}
+{{- end }}