fix(sandbox): improve docker image existence check error handling

- Modifies `dockerImageExists` to inspect stderr when the exit code is non-zero.
- Returns `false` only if the error explicitly indicates "No such image".
- Throws an error with the stderr content for all other failures.
This commit is contained in:
google-labs-jules[bot] 2026-01-23 22:44:07 +00:00 committed by Peter Steinberger
parent 78ef609d7b
commit 2091b4aed0

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