Lxc pihole / /etc/resolv.conf is still overwritten on reboot

[daad919]

I have a problem setting my static dns after changing ip adress for my pihole setup.
Changing the resolv.conf is possible but after rebooting, the changes are swapped to the previous settings setup.

I have set a static ip in the gui / network /ip , but this got ignored in the resolv.conf file. every time i reboot.

Already tried the following:
nano /etc/resolv.conf
adapt config
save
chattr +i /etc/resolv.conf
but get following error:
chattr: Operation not permitted while setting flags on /etc/resolv.conf
2)
nano /etc/dhcp/dhclient-enter-hooks.d/nodnsupdate
add:
!/bin/sh make_resolv_conf(){ : }
save
chmod +x /etc/dhcp/dhclient-enter-hooks.d/nodnsupdate
3)
nano /etc/dhcp/dhclient.conf
add:
prepend domain-name-servers 1.2.3.4
Save
4)
nano /etc/NetworkManager/NetworkManager.conf
add:
dns=none
save

But the problem persists, the resolv.conf is still overwritten after a reboot.
Any other ideas?