uint16 type for port + env getter

config/helper.go

@@ -39,3 +39,14 @@ func getEnvUint(key string, fallback uint) uint {
 	}
 	return fallback
 }
+
+func getEnvPort(key string, fallback uint16) uint16 {
+	if value, ok := os.LookupEnv(key); ok {
+		num, err := strconv.ParseUint(value, 10, 16)
+		if err != nil {
+			return fallback
+		}
+		return uint16(num)
+	}
+	return fallback
+}