wait-online when any-interface ready

sudo tee /etc/systemd/system/systemd-networkd-wait-online.service.d/wait-for-only-one-interface.conf <<EOF
[Service]
ExecStart=
ExecStart=/usr/lib/systemd/systemd-networkd-wait-online --any
EOF

sudo systemctl daemon-reload
sudo systemctl cat systemd-networkd-wait-online.service