Hiroshi SHIBATA c99e07fe4e Skip cleaning up the default docker image to avoid redundant pulls
The default image (clang-20) is reused across multiple steps within
the same job. Only remove non-default images after use.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-30 11:57:04 +09:00
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