feat: Add mapping for new arch arm64 (Apple M1)

Now supports Darwin arm64 (aka M1, aka Apple Silicon)

nsd/nodejs/arch_darwin_arm64.go

@@ -0,0 +1,8 @@
+package nodejs
+
+// CurrentArch and CurrentURL describe how the URL of the nodejs download will look like
+const (
+	CurrentArch      string        = "darwin-x64" //until nodejs provides a specific image for arm64 we'll use x64
+	CurrentURL       DownloadURL   = Stable
+	CurrentExtension FileExtension = TarXz
+)