make some bundles arch-compatible, more default packages for arch

groups/os.py

@@ -13,16 +13,14 @@ groups['raspberry'] = {
 
 groups['linux'] = {
     'subgroups': {
+        'arch',
         'debian',
         'raspberry',
     },
     'bundles': {
-        'apt',
-        'backup-client',
         'basic',
         'cron',
         'iptables',
-        'molly-guard',
         'openssh',
         'postfix',
         'sshmon',
@@ -61,13 +59,31 @@ groups['linux'] = {
     'pip_command': 'pip3',
 }
 
+groups['arch'] = {
+    'bundles': {
+        'pacman',
+    },
+    'metadata': {
+        'icinga_options': {
+            'exclude_from_monitoring': True,
+        },
+    },
+    'os': 'arch',
+}
+
 groups['debian'] = {
     'subgroups': {
         'debian-buster',
         'debian-bullseye',
         'debian-sid',
     },
-    'os': 'debian'
+    'bundles': {
+        'apt',
+        'backup-client',
+        'molly-guard',
+    },
+    'os': 'debian',
+    'pip_command': 'pip3',
 }
 
 groups['debian-buster'] = {