Hi there,
sure so basically I followed the instructions here: How to set a static IP for your Umbrel machine.
Especially in this section
Option B - setup a fix IP in your RPi settings
Add the following to the /etc/dhcpcd.conf file:
#Configuration static IP address (CHANGE THE VALUES TO FIT FOR YOUR NETWORK)
interface eth0
static ip_address=192.168.178.100/24
static routers=192.168.178.1
static domain_name_servers=192.168.178.1
After the changes I had to restart umbrel for it to take effect.