Add support for Arch Linux distribution

This change adds support for the Arch Linux distribution (if is arch based on amd/x64) to the IsArchLinux() function.
The function will now return true if the operating system is Arch Linux or Arch ARM.

pkg/arch/arch.go

@@ -11,7 +11,7 @@ func IsArchLinux() bool {
 	if err != nil {
 		return false
 	}
-    return strings.TrimSpace(string(out)) == "archarm"
+    return strings.TrimSpace(string(out)) == "archarm" || strings.TrimSpace(string(out)) == "arch"
 }
 
 func ArchCommands() []string {