dangernoodle-io / TaipanMiner / 25002027208

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ci: split toolchain + ccache caches; no restore-keys on ccache (#224)

CI v0.15.1/v0.15.2 binaries diverged from local builds by ~265 KB and
task-watchdog rebooted on tdongle (mining_task hot loop). bitaxe was
unaffected because asic_task replaces mining_task on those boards.
Root cause: the build cache combined ~/.platformio with ~/.cache/ccache
under one key, with restore-keys falling back to the previous build's
cache prefix. PR #223 (npm ci + dependencies.lock) reduced the divergence
but ccache still served stale objects from pre-bb-v0.16.4 builds because
its key only hashed platformio.ini.

Split into two caches:
- ~/.platformio (toolchain): keyed on platformio.ini, keeps restore-keys
  (toolchain is version-pinned via the platform URL anyway).
- ~/.cache/ccache: keyed on platformio.ini + scripts/fetch_breadboard.py
  + dependencies.lock + sdkconfig defaults; NO restore-keys, so a key
  miss is a clean miss instead of a fallback to stale objects.

Refs TA-261.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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