Persist configuration

[ignoramous]

Allow users to set custom dns responses. As example, for the below given dns ruleset:

domain	a	aaaa
x1.org	ams.vm.ip.4	ams:vm:ip::6
x2.org	lhr.vm.ip.4	lhr:vm:ip::6
*	maa.vm.ip.4	maa:vm:ip::6

midway responds with corresponding IPs such that the traffic is routed to those specific IPs ([x1|x2].org -> VMs in ams; while all other domains * routed to VMs in maa).

Probably through litestream? https://tip.litestream.io/guides/read-replica/