pihole_sync

TODO

Makefile: Write local install target
Write rc.d init scripts for bin/pihole_sync.sh
- Base off of /etc/rc.d/S19dnsmasq
- OpenWrt v22.03.3 r20028-43d71ad93e
Install script
Implement sync_pull, adjust_outgoing_config, on_pull_finish
Implement .env app configuration
- See ./.env.dist
Create a ~~Debian~~ opkg package?