Public/Remove-AzRuntimeEnvironment.ps1

function Remove-AzRuntimeEnvironment {
    [Alias("Remove-RuntimeEnvironment")]
    param (
        [Parameter(Mandatory = $true)]
        [string]$SubscriptionId,
        
        [Parameter(Mandatory = $true)]
        [string]$ResourceGroupName,
        
        [Parameter(Mandatory = $true)]
        [string]$AutomationAccountName,
        
        [Parameter(Mandatory = $true)]
        [string]$RuntimeEnvironmentName
    )

    $ErrorActionPreference = "Stop"

    try {
        $Params = @{
            Uri     = "https://management.azure.com/subscriptions/$SubscriptionId/resourceGroups/$ResourceGroupName/providers/Microsoft.Automation/automationAccounts/$AutomationAccountName/runtimeEnvironments/$($RuntimeEnvironmentName)"
            Method  = "DELETE"
            Headers = (Get-AzHeader)
        }
        return Invoke-AzAPI @Params
    }
    catch {
        throw $_
    }
}