dhcpcd overwrites resolv.conf on static IP VMs

Debian 13 ships dhcpcd-base which overwrites /etc/resolv.conf on boot. On a static IP system with no DHCP server, it writes an empty file — breaking all DNS. Purge dhcpcd-base after switching to static IP.

Symptoms: `apt-get update` fails with "Temporary failure resolving", but `dig` works with explicit `@10.1.99.100`. The resolv.conf was emptied by dhcpcd on reboot.\n\nFix: `apt-get purge dhcpcd-base` and manually write `/etc/resolv.conf`.\n\nDiscovered during Docker VM deployment (2026-03-23).

Affected entities:VM 200 — Docker