Copy debian install scripts

mullvad-vpn-daemon/mullvad-vpn-daemon.pre-install

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -eu
+
+if which systemctl &> /dev/null && systemctl is-system-running | grep -vq offline &> /dev/null; then
+    if systemctl status mullvad-daemon &> /dev/null; then
+        /opt/Mullvad\ VPN/resources/mullvad-setup prepare-restart || true
+        systemctl stop mullvad-daemon.service
+        systemctl disable mullvad-daemon.service
+        systemctl disable mullvad-early-boot-blocking.service || true
+        cp /var/log/mullvad-vpn/daemon.log /var/log/mullvad-vpn/old-install-daemon.log \
+            || echo "Failed to copy old daemon log"
+    fi
+fi
+
+rm -f /var/cache/mullvad-vpn/relays.json
+rm -f /var/cache/mullvad-vpn/api-ip-address.txt