构建源支持jdk21项目

[xggz]

java21 是最新的lts版本，希望支持一下

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Title: The build source supports the jdk21 project

java21 is the latest lts version, I hope to support it

[yangkaa]

预计在 5.18 版本中推出支持用户自行上传语言包的功能。到时候即可自行升级 JDK 版本、各类源码构建版本。当前你应该可以通过自定义 OpenJDK ，设置你需要的JDK版本。

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It is expected that the function to support users to upload language packs will be launched in version 5.18. At that time, you can upgrade the JDK version and various source code build versions by yourself. Currently you should be able to set the JDK version you need by customizing OpenJDK.

[ZhangSetSail]

自定义源码包功能暂时推迟，但是构建java的时候支持自定义jdk构建的你可以试试。

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The custom source code package function is temporarily postponed, but you can try it if it supports custom jdk build when building java.

[linpeilie]

自定义JDK版本，一直报这个错：

builder:-----> Start pre-compile...
builder:-----> Detected CPU architecture linux-x86_64
builder:-----> Prepare Handle Language Java-maven RuntimeVersion
builder:-----> Detection Java-Maven runtime java.runtime.version=1.8
builder:-----> Detection Maven maven.version=3.9.1
builder:-----> Use custom Java-Maven Procfile
builder:-----> .slugignore config success
builder:-----> Prepare Handle Success
builder:-----> Use local Jvm common... done
builder:-----> Installing Custom JDK...
builder:-----> Synchronize Custom JDK files jdk-21.0.2
builder:
builder: gzip: stdin: not in gzip format
builder: tar: Child returned status 1
builder: tar: Error is not recoverable: exiting now
Build app version from source code failure,build code job exec failure

换了好几个地址都这个错