bundles/systemd-networkd: add option for setting static routes

bundles/systemd-networkd/files/template-iface-nodhcp.network

@@ -16,19 +16,25 @@ Name=${interface}
 Address=${ip}/${prefix}
 
 % endfor
+% for route in config.get('routes', {}):
+[Route]
+Gateway=${route['via']}
+Destination=${route['to']}
+GatewayOnlink=yes
 
+% endfor
 % if 'gateway4' in config:
 [Route]
 Gateway=${config['gateway4']}
 GatewayOnlink=yes
-% endif
 
+% endif
 % if 'gateway6' in config:
 [Route]
 Gateway=${config['gateway6']}
 GatewayOnlink=yes
-% endif
 
+% endif
 [Network]
 DHCP=no
 IPv6AcceptRA=no

nodes/home/downloadhelper.py

@@ -16,6 +16,13 @@ nodes['home.downloadhelper'] = {
                 'ips': {
                     '172.19.138.27/24',
                 },
+                'routes': [
+                    {
+                        # VPN
+                        'to': '172.19.136.0/22',
+                        'via': '172.19.138.1',
+                    },
+                ],
             },
         },
         'backups': {