feat: run extraVolumes through templating

We wanted to add custom error pages for our load balancer, and since each load balancer depence on their own ingress-nginx we need to be able to template the volume configmap.

```
    extraVolumes:
      - name: custom-error-pages
        configMap:
          name: "{{ .Release.Name }}-custom-error-pages"```

Now gives us:
```
      volumes: 
        - configMap:
            name: '{{ .Release.Name }}-custom-error-pages'
```

Author: Kyrremann

charts/ingress-nginx/templates/controller-daemonset.yaml

@@ -234,7 +234,7 @@ spec:
         {{- end }}
       {{- end }}
       {{- if .Values.controller.extraVolumes }}
-        {{ toYaml .Values.controller.extraVolumes | nindent 8 }}
+        {{ tpl (toYaml .Values.controller.extraVolumes) $ | nindent 8 }}
       {{- end }}
     {{- end }}
 {{- end }}