Yes, edit the /etc/resolv.conf. You don't need to restart anything.
The address you asigned to the bridge ist the Management adress of the PVE. VMs/CTs have their own configuration.
You could assign the 38.189.78.26 to the vmbr0. The 38.189.78.27 to VM/CT
If you don't need the PVE reachable...