use dnsmasq for translations generic worker

Hopefully a fix for mozilla/translations#549

builders/gw_translations_gcp.yaml

@@ -13,6 +13,7 @@ script_directories:
   - ubuntu-jammy
   - ubuntu-worker-requirements
   - ubuntu-cuda
+  - ubuntu-dnsmasq
   - generic-worker-linux
   - worker-runner-linux
   - worker-runner-gw-systemd  # TODO: merge with 'generic-worker-linux'?

scripts/ubuntu-dnsmasq/01-switch-to-dnsmasq.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -exv
+
+# init helpers
+helpers_dir=${MONOPACKER_HELPERS_DIR:-"/etc/monopacker/scripts"}
+for h in ${helpers_dir}/*.sh; do
+    . $h;
+done
+
+# install dnsmasq before disabling systemd-resolved, because we need working
+# dns to do so
+apt-get install -y dnsmasq
+# disable systemd-resolved
+systemctl stop systemd-resolved
+systemctl disable systemd-resolved
+# remove symlink to systemd-resolved's resolv.conf; replace it with a version
+# that points at the dnsmasq server that's about to start up
+rm /etc/resolv.conf
+echo "nameserver 127.0.0.1" > /etc/resolv.conf
+echo "server=8.8.8.8" >> /etc/dnsmasq.conf
+systemctl start dnsmasq
+systemctl enable dnsmasq