Insert teamcity artifact pathTeamcity into powershell script - powershell

Question

I am adding a project into teamcity and need to add a powershell script to change some config settings and generate a zipped artifact. I have built and tested the script file outside of teamcity but in order to make it work during the build I need to get the path where the artifact is built to.
Is there a way to replace in the code below the c:\artifacts\myproject\build\38 with a teamcity parameter which will always pick up the latest build directory?
#Find and replace various app.config settings
$location = C:\Artifacts\MyProject\Build\38\myApp\myConfig.config";
(Get-Content $location) |
ForEach-Object { $_ -replace '<add key="platform" value="xxxx"/>', '<add key="platform" value="test"/>' } |
Set-Content $location
#Should take source directory and create a zip file from it
$source = "C:\Artifacts\MyProject\Build\38\myApp\"
$destination = "C:\Artifacts\FrontOfficeApi\Build\38\artifact.zip"
GenerateZipFile -DestinationFilePath $destination -SourcePath $source
Many thanks

Answer 1

$buildDirectory = "%teamcity.build.chec‌​koutDir%" Will give you the directory where the source code has been checked out to, so you can work relatively from there. This is if you are running the PowerShell as source code, otherwise you can pass parameters into a PowerShell script using the same variable.
Hope this helps