startup.ps1

$VerbosePreference = "Continue"
$ErrorActionPreference = "Continue"
$ContainerAdmin = $env:ContainerAdmin
$ContainerPassword = $env:ContainerPassword
if ((Get-LocalUser -Name $ContainerAdmin ).Count -eq 1) {
    Write-Verbose "Admin container user already exists, updating password to $ContainerPassword"
    Set-localuser -Name $ContainerAdmin -Password (ConvertTo-SecureString  $ContainerPassword -AsPlainText -Force) 
}
else {
    Write-Verbose "Admin container does not exist, creating user"
    new-LocalUser -Name $ContainerAdmin -Password  (ConvertTo-SecureString  $ContainerPassword -AsPlainText -Force) 
}
if (((Get-LocalGroupMember administrators) -notmatch $ContainerAdmin)) {
    Write-Verbose "$containeradmin is not part of local Administrator's group, adding it"
    Add-LocalGroupMember -Group Administrators -Member $ContainerAdmin 
}