Disambiguate icon for daily builds on Windows (#5467)

* Disambiguate icon for daily builds on Windows.
Some code had to be borrowed from build.psm1 because this script has to be self contained in case it gets executed by only downloading this file via the published download link https://twitter.com/Steve_MSFT/status/930585082451992576

tools/install-powershell.ps1

@@ -156,6 +156,19 @@ try {
         Move-Item -Path $contentPath -Destination $Destination
     }
 
+    # Edit icon to disambiguate daily builds.
+    if ($IsWinEnv -and $Daily.IsPresent) {
+        if (-not (Test-Path "~/.rcedit/rcedit-x64.exe")) {
+            Write-Verbose "Install RCEdit for modifying exe resources" -Verbose
+            $rceditUrl = "https://github.com/electron/rcedit/releases/download/v1.0.0/rcedit-x64.exe"
+            New-Item -Path "~/.rcedit" -Type Directory -Force > $null
+            Invoke-WebRequest -OutFile "~/.rcedit/rcedit-x64.exe" -Uri $rceditUrl
+        }
+
+        Write-Verbose "Change icon to disambiguate it from a released installation" -Verbose
+        & "~/.rcedit/rcedit-x64.exe" "$Destination\pwsh.exe" --set-icon "$Destination\assets\Powershell_av_colors.ico"
+    }
+
     ## Change the mode of 'pwsh' to 'rwxr-xr-x' to allow execution
     if (-not $IsWinEnv) { chmod 755 $Destination/pwsh }