我用以下代码编写了docker-compose

version: "3.8"
services:
  php:
    container_name: php
    build:
      context: ./php
      args:
        PHPVERSION: "7.4"
        XDEBUGVERSION: "2.9.1"

我有这样的Dockerfile

ARG PHPVERSION
ARG XDEBUGVERSION
FROM php:${PHPVERSION}-fpm
RUN apt-get update && apt-get install -y \
    && pecl install xdebug-${XDEBUGVERSION} \
    && docker-php-ext-enable xdebug

当我尝试编译php时，我发现我的参数没有解析。对于php，它没有给予我错误。看起来它只是下载了最新版本。但是对于xdebug，我得到了错误

root@Server:# docker-compose up --build
Building php
Step 1/8 : ARG PHPVERSION
Step 2/8 : ARG XDEBUGVERSION
Step 3/8 : FROM php:${PHPVERSION}-fpm
 ---> 876051031ecc
Step 4/8 : RUN apt-get update && apt-get install -y  && pecl install xdebug-${XDEBUGVERSION}     
....
....
parsePackageName(): "" is neither a valid version nor a valid state in "xdebug-"
invalid package name/package file "xdebug-"
install failed
ERROR: Service 'php' failed to build: The command '/bin/sh -c apt-get update && apt-get install -y
&& pecl install xdebug-${XDEBUG_VERSION}     
&& docker-php-ext-enable xdebug' returned a non-zero code: 1