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The travis network build cache (activated via commit message, for whitelisted commiters) was added a few months back. It worked well for a while, but ultimately
it's seen little use in practive by commiters.
While it was gratifying to see this actually worked, all the additional
magic in ci/ doesn't pay for itself in practice, so I've decided to retire this
unless there are strong objections and get a simpler ci/ in return.
The build cache system got an upgrade as a side-effect of this
work and
scripts/use_build_cache.py
remains a useful bit of kit.Not entirely wasted effort after all.
xref #3383