chore(hole-punch): deterministic interface mapping#858
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Summary
The router SNATs LAN traffic out to the internet, but
router/run.shassumed a fixedinterface mapping (
eth0= internet,eth1= lan). Docker doesn't guarantee that order,so when it comes up reversed the SNAT rule is built backwards and the hole-punch test
fails nondeterministically.
This PR makes the router detect its external interface instead: it's the one that routes
toward the
relay(which lives on theinternetnetwork), viaip route get <relay_ip>.A short retry loop covers
relayDNS not resolving yet at startup. Nogenerator.tschange.