use add instead of invoke web request in nanoserver docker file (#6255)

TravisEz13 · web-flow · commit fdc20c8a5d6e · 2018-02-26T18:10:29.000-08:00
diff --git a/docker/release/nanoserver/Dockerfile b/docker/release/nanoserver/Dockerfile
@@ -17,7 +17,7 @@ ENV PS_DOWNLOAD_URL https://github.com/PowerShell/PowerShell/releases/download/v
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
 
 RUN if (!($env:PS_VERSION -match '^\d+\.\d+\.\d+(-\w+(\.\d+)?)?$' )) {throw ('PS_Version ({0}) must match the regex "^\d+\.\d+\.\d+(-\w+(\.\d+)?)?$"' -f $env:PS_VERSION)}
-RUN Invoke-WebRequest $Env:PS_DOWNLOAD_URL -OutFile powershell.zip
+ADD $PS_DOWNLOAD_URL /powershell.zip
 
 RUN Expand-Archive powershell.zip -DestinationPath \PowerShell
 
