bundles/wireguard: better dependency management

bundles/wireguard/items.py

@@ -8,6 +8,11 @@ files = {
     },
 }
 
+deps = set()
+
+if node.has_bundle('apt'):
+    deps.add('pkg_apt:wireguard')
+
 health_checks = {}
 for number, (peer, config) in enumerate(sorted(node.metadata.get('wireguard/peers', {}).items())):
     files[f'/etc/systemd/network/wg{number}.netdev'] = {
@@ -22,7 +27,7 @@ for number, (peer, config) in enumerate(sorted(node.metadata.get('wireguard/peer
             'psk': config['psk'],
             'pubkey': config['pubkey'],
         },
-        'needs': {'pkg_apt:wireguard'} if node.has_bundle('apt') else set(),
+        'needs': deps,
         'triggers': {
             'svc_systemd:systemd-networkd:restart',
         },