switch layout

builders/nix-node-builder.psm1

@@ -40,6 +40,10 @@ class NixNodeBuilder : NodeBuilder {
         return "${base}/v$($this.Version)/node-v$($this.Version)-$($this.Platform)-$($this.Architecture).tar.gz"
     }
 
+    [void] UnpackBinaries($archivePath) {
+        Unpack-TarArchive -ArchivePath $archivePath -OutputDirectory $this.ArtifactLocation
+    }
+
     [void] CreateInstallationScript() {
         <#
         .SYNOPSIS