make-ring.py: Detect Arch Linux

Reviewed-by: Alexandre Viau <alexandre.viau@savoirfairelinux.com>
Change-Id: I928c0f0aa385661185be935621603f77038af810

make-ring.py

@@ -408,6 +408,8 @@ def parse_args():
 def choose_distribution():
     system = platform.system().lower()
     if system == "linux" or system == "linux2":
+        if os.path.isfile("/etc/arch-release"):
+            return "Arch Linux"
         with open("/etc/os-release") as f:
             for line in f:
                 k,v = line.split("=")