claudio 6915c30911 build(backend): cache torch wheel + pip downloads across rebuilds ...

Splits torch+torchvision into its own RUN layer so edits to
requirements.txt don't invalidate the ~200MB CPU-only torch download.
Adds buildkit cache mounts on both pip-install layers so even when a
layer is invalidated (or buildkit evicts it) the wheel is reused from
the on-disk pip cache instead of refetching from download.pytorch.org.

Triggered by two consecutive deploy failures where pytorch.org timed
out mid-download (2026-05-13 ~21:41 and possibly ~22:47).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-13 23:08:10 +02:00

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