VSTS - Determine Last Successful Git Commit Id.ps1

param(
    [string] $LastGitCommitId,
    [string] $AccessToken,
    [string] $AzureDevOpsAccountName,
    [string] $TeamProjectId,
    [string] $ReleaseDefinitionId
)
if ([string]::IsNullOrEmpty($LastGitCommitId))
{
    $hdrs = @{}
    $hdrs.Add("Authorization","Bearer $AccessToken")

    try
    {
        $LatestSuccessfulRelease = Invoke-RestMethod -Method Get -Uri "https://$AzureDevOpsAccountName.vsrm.visualstudio.com/$TeamProjectId/_apis/release/releases?definitionId=$ReleaseDefinitionId&resultFilter=succeeded&`$top=1" -ContentType 'application/json' -Headers $hdrs

        if ($LatestSuccessfulRelease.count -eq 1)
        {
            $ReleaseDetailUrl = $LatestSuccessfulRelease.value[0].url
            try
            {
                $ReleaseArtifactDetail = Invoke-RestMethod -Method Get -Uri "$ReleaseDetailUrl" -ContentType 'application/json' -Headers $hdrs

                if ($ReleaseArtifactDetail.PSobject.Properties.name -notcontains "innerException")
                {
                    $artifacts = $ReleaseArtifactDetail.artifacts | where {$_.definitionReference.project.id -eq $TeamProjectId}
                    if ($artifacts -ne $null)
                    {
                        $GitCommitId = $artifacts[0].definitionReference.pullRequestMergeCommitId.id
                        Write-Host "##vso[task.setvariable variable=LastGitCommitId;]$GitCommitId"                
                    }
                }
                else
                {
                    Write-Host "##vso[task.complete result=Failed;]Error in getting Release Details"
                }
            }
            catch
            {
                Write-Host "##vso[task.complete result=Failed;]Error in getting Release Details"
            }
        }
        else
        {
            Write-Host "##vso[task.complete result=Failed;]Error in getting the latest successful release."
        }
    }
    catch
    {
        Write-Host "##vso[task.complete result=Failed;]Error in getting the latest successful release."
    }
}

Hi Vincent,
Can you please help with how to use this script in VSTS?