Env: Add XRAY_LOCATION_CERT variable

[patterniha]

Wrongly, the source of relative path for certificate files is "command-run" folder: #4531

also, it is not elegant that we put all certificate files in exec folder, so we need environment-variable for certificate files.

therefore, gui/panel can create a folder for certificate files and set certificate-environment-variable to that folder.

also, v2rayNG only has one folder for asset files, so in v2rayNG we can set
geo-environment-variable=certificate-environment-variable and then we can also add certificate files.

///

logic:

if cert/key path is absolute path:
    read from that path
else:
    if we have certificate-environment-variable:
        read from certificate-environment-variable folder
    else:
        read from exec folder

[RPRX]

@patterniha

[patterniha]

@RPRX

done.

[RPRX]

@patterniha

[patterniha]

@RPRX

done, all you had to do was say rename all "certificate" to "cert" :)

[RPRX]

GitHub 自动生成的 release notes 只包括 PR，并不包括直接的 commit，也不包括 2d3210e 这种 force-push，每次都要花些时间手动补，感觉很烦，谁来写个爬虫用正则匹配一下 commits history

[Fangliding]

直接改readdfile方法去exec folder读一遍没有再fallback去asset目录(默认二进制位置)读一遍就行了 以后类似的东西直接调这个方法还能复用 这还单独搓个出来

[patterniha]

Just change the readdfile method to read it once in the exec folder without fallback to the asset directory (default binary location) and read it once. In the future, similar things can be reused by calling this method directly. This is not a separate one.

we can add "readFileFromExec" function:

func readFileFromExec(file string) ([]byte, error) {
	if filepath.IsAbs(file) {
		return ReadFile(file)
	}
	return ReadFile(filepath.Join(getExecutableDir(), file))
}

But it is not useful for our needs, because we should first check if the file-path is absolute then check the environment-variable and then check the exec folder.

Or maybe I didn't understand what you meant, anyway, you can make any changes you want.

[RPRX]

我主要是觉得加个 XRAY_LOCATION_CERT 是可以有的，毕竟 XRAY_LOCATION_ASSET 都有

反正我加这些东西都是从 为了全人类 以及完善 Xray 基础功能的角度切入

[RPRX]

比如以后可能再加个 XRAY_LOCATION_LOG（带上 masterKeyLog？），然后它们的共用逻辑可以抽出来、代码复用

好像暂时没其它涉及到 file 的配置项了

话说 masterKeyLog 这东西支持 uTLS 应该没难度吧？文档写的不支持，我升级 REALITY 时顺便看一下

[yuhan6665]

#2911

[RPRX]

#2911

@Fangliding 文档需要更正 masterKeyLog，以及 expectIPs 更名 expectedIPs，以及新增 XRAY_LOCATION_CERT