DOTNET_ENV is not set when environment name is defined from source code

[MrDave1999]

Example:

new EnvLoader()
     .SetEnvironmentName("test")
     .LoadEnv();

System.Console.WriteLine(Env.IsTest()); // output: False (should be True)

The LoavEnv method does not set the DOTNET_ENV variable and for that reason the output is False instead of True, since the Env class methods access the DOTNET_ENV variable.

Another example:

new EnvLoader().LoadEnv();
System.Console.WriteLine(Env.Development()); // output: False (should be True)