Merge pull request #1711 from aledbf/add-helper-to-funcmap

Automatic merge from submit-queue

[nginx-ingress-controller]: Add function helpers to nginx template

fixes #1695

controllers/nginx/nginx/template/template.go

@@ -52,6 +52,11 @@ var (
 		"buildProxyPass":      buildProxyPass,
 		"buildRateLimitZones": buildRateLimitZones,
 		"buildRateLimit":      buildRateLimit,
+		"contains":            strings.Contains,
+		"hasPrefix":           strings.HasPrefix,
+		"hasSuffix":           strings.HasSuffix,
+		"toUpper":             strings.ToUpper,
+		"toLower":             strings.ToLower,
 	}
 )