add preliminary netplan config

netplan/01-ens3.yaml

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+network:
+  version: 2
+  renderer: networkd
+  ethernets:
+#    ens3:
+      dhcp4: false
+      dhcp6: false
+    switchports:
+     match: {name: "ens3*"}
+  bridges:
+    br0:
+      interfaces: [switchports]
+      addresses:
+        - 144.76.238.46/27
+        - 144.76.238.57/27 # needs extra route
+        - 144.76.238.58/27 # needs extra route
+        - 144.76.187.250/27 # needs extra route
+        - 2a01:4f8:201:142d::1/64
+        - 2a01:4f8:201:142d::2/64
+      routes:
+        - to: 144.76.238.32/27
+          via: 144.76.238.33
+          on-link: true
+        - to: 144.76.187.248/29
+          via: 144.76.187.249
+          on-link: true
+      dhcp4: true
+      gateway6: fe80::1
+      gateway4: 144.76.238.33

netplan/02-bridges.yaml

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+network:
+  version: 2
+  renderer: networkd
+
+# not used in production
+  bridges:
+    brdmz: &defaults
+      dhcp4: false
+      dhcp6: false
+      parameters:
+        stp: false
+        forward-delay: 0
+      addresses:
+        - 192.168.250.1/24
+    brmgmt:
+      <<: *defaults
+      addresses:
+        - 192.168.255.1/24
+    brapp:
+      <<: *defaults
+      addresses:
+        - 192.168.251.1/24
+    brdmz:
+      <<: *defaults
+      addresses:
+        - 192.168.252.1/24