config.
    AddJsonFile("appsettings.json").
    AddJsonFile("appsettings.docker.json", true).
    AddEnvironmentVariables();

实际上足以使用环境变量覆盖应用设置值.

is actually enough to override appsettings values using environment variables.

假设您的appsettings.json文件中包含以下内容；

Let's say you have the following in your appsettings.json file;

{
  "Logging": {
      "Level": "Debug"
  }
}

您可以通过将名为Logging:Level的环境变量设置为您的首选项值来覆盖Logging.Level的值.

you can override value of Logging.Level by setting the environment variable named Logging:Level to the value of your preference.

请注意，:用于指定环境变量键中的嵌套属性.

Be aware that : is used to specify nested properties in environment variable keys.

也请注意:来自

Also note: from docs;

如果不能在系统的环境变量名称中使用冒号(:)，请用双下划线(__)替换冒号(:).