fix(nginx-system): Refactor config setup to be extendable

infrastructure/nginx-system/release.yaml

@@ -15,12 +15,21 @@ spec:
       version: 4.0.17
   interval: 5m
   valuesFrom:
+    - kind: ConfigMap
+      name: ingress-nginx-base-values
+      valuesKey: values.yaml
     - kind: Secret
       name: ingress-nginx-override-values
       valuesKey: values-overrides.yaml
       optional: true
-
-  values:
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: ingress-nginx-base-values
+  namespace: nginx-system
+data:
+  values.yaml: |
     controller:
       ingressClassResource:
         name: nginx