Add Guix System

> closes #303

Author: Samuel FORESTIER

distro.py

@@ -224,6 +224,7 @@ def id():
     "freebsd"       FreeBSD
     "midnightbsd"   MidnightBSD
     "rocky"         Rocky Linux
+    "guix"          Guix System
     ==============  =========================================
 
     If you have a need to get distros for reliable IDs added into this set,

tests/resources/distros/guix/etc/os-release

@@ -0,0 +1,8 @@
+NAME="Guix System"
+ID=guix
+PRETTY_NAME="Guix System"
+LOGO=guix-icon
+HOME_URL="https://guix.gnu.org"
+DOCUMENTATION_URL="https://guix.gnu.org/en/manual"
+SUPPORT_URL="https://guix.gnu.org/en/help"
+BUG_REPORT_URL="https://lists.gnu.org/mailman/listinfo/bug-guix"

tests/test_distro.py

@@ -263,6 +263,14 @@ def test_fedora30_os_release(self):
         }
         self._test_outcome(desired_outcome)
 
+    def test_guix_os_release(self):
+        desired_outcome = {
+            "id": "guix",
+            "name": "Guix System",
+            "pretty_name": "Guix System",
+        }
+        self._test_outcome(desired_outcome)
+
     def test_kvmibm1_os_release(self):
         desired_outcome = {
             "id": "kvmibm",