You might think of editing /etc/netplan/50-cloud-init.yaml, but why would you when /etc/cloud/cloud.cfg.d/50-curtin-networking.cfg fucks you over?

network:
  version: 2
  ethernets:
    eth0:
      match:
        macaddress: 52:54:00:46:d6:b3
      mtu: 9000
      set-name: eth0
    eth1:
      match:
        macaddress: 52:54:00:ba:da:c5
      mtu: 9000
      set-name: eth1
  bonds:
    bond0:
      interfaces:
        - eth0
        - eth1
      parameters:
        down-delay: 0
        lacp-rate: slow
        mii-monitor-interval: 100
        mode: 802.3ad
        transmit-hash-policy: layer2
        up-delay: 0
  bridges:
    br-maas:
      interfaces:
        - bond0.1
      addresses:
        - 172.16.1.1/24
      parameters:
        forward-delay: 15
        stp: false
    br-mgmt:
      interfaces:
        - bond0.2
      addresses:
        - 172.16.2.1/24
      parameters:
        forward-delay: 15
        stp: false
  vlans:
    bond0.1:
      id: 1
      link: bond0
    bond0.2:
      id: 2
      link: bond0
    bond0.12:
      id: 12
      link: bond0
      mtu: 1500
      addresses:
        - 10.0.0.30/24
      gateway4: 10.0.0.254