two leading $ signs on the definition of the certificate path was causing some issues!

Author: scbedd

eng/common/testproxy/test-proxy-tool.yml

@@ -30,7 +30,7 @@ steps:
 
   - ${{ if eq(parameters.runProxy, 'true') }}:
     - pwsh: |
-        Write-Host "##vso[task.setvariable variable=ASPNETCORE_Kestrel__Certificates__Default__Path]$${{ parameters.templateRoot }}/eng/common/testproxy/dotnet-devcert.pfx"
+        Write-Host "##vso[task.setvariable variable=ASPNETCORE_Kestrel__Certificates__Default__Path]${{ parameters.templateRoot }}/eng/common/testproxy/dotnet-devcert.pfx"
         Write-Host "##vso[task.setvariable variable=ASPNETCORE_Kestrel__Certificates__Default__Password]password"
         Write-Host "##vso[task.setvariable variable=PROXY_MANUAL_START]true"
       displayName: 'Configure Kestrel and PROXY_MANUAL_START Variables'