Avery Pennarun ff4d495e39 ipn/ipnlocal: add TS_FORCE_CACHE_NETMAP envknob to force netmap caching
Allow clients to force netmap caching via the TS_FORCE_CACHE_NETMAP
environment variable, bypassing the requirement for the control server
to grant the cache-network-maps node capability.

This is useful for tsnet users who want faster startup times via
cached netmaps but whose control plane doesn't grant the capability.

Change-Id: I447b57311940d51a5ce9021236add48e0333d0b5
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-04-11 21:21:11 +02:00
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