Do not support bucket without nested bucket folder

[Ash258]

This will save me lots of checks and my sanity.

If bucket do not have nested bucket folder fail and create new issue about this

[Ash258]

Entrypoint.ps1

if (-not (Test-Path $BUCKET_ROOT\bucket)) {
    $js = Invoke-GithubRequest ".../issues/" | Select-Object -ExpandProperty Content | ConvertFrom-Json
	$js | Where-Object { $_.Author -eq 'Me' -and $_.Title -eq 'Use nested bucket' }
	if (-not $js) { New-Issue }
}