feat(tvix/boot): introduce useNarBridge parameter r/8322

This is still useful to test the ingestion part of nar-bridge.

Reintroduce the logic removed in cl/11398, but put it behind a
`useNarBridge` parameter, defaulting to false.

Add an additional target to tvix.boot.tests,
`closure-nixos-nar-bridge`, which does the same as `closure-nixos`,
except seeding the contents through nar-bridge.

Change-Id: Iee87d5d9c7b7d02df11ee47fbc3f1fbe951935e9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11891
Tested-by: BuildkiteCI
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Autosubmit: flokli <flokli@flokli.de>

0 files changed, 0 insertions, 0 deletions