This adds `powershell` resource support for non-Windows OSs via `pwsh`
and Base64 encoded commands.
Signed-off-by: Jerry Aldrich <jerryaldrichiii@gmail.com>
Unsupported operating systems AND the mockloader when using inspec analysis tools may lead to powershell being called with the command being `nil`, because the resource skips during the initialize phase. Instead, propagate an empty string so that `command` has a valid input and then skip the resource.
Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
