Add ability to pass ENV to command

[viranch]

This is a feature request to add a new configuration option that controls inheriting environment variables to the command. This is particularly useful for passing secrets via the environment variables to the exec script/command (using command => "script.sh $SECRET" will cause the secret to show up in ps aux).

It could be a simple switch like:

exec {
    command => "bash some_script.sh"
    inherit_environment => true
}

and then simply pass ENV to IO.popen call:

if @inherit_environment
    @io = IO.popen(ENV, @command)
else
    @io = IO.popen(@command)
end

When LS is run with the SECRET environment variable set, the command will also inherit it and available for use.