CST_TIMEOUT (default 300 s) kills a hanging run; existing cleanup removes the
containers; exit code 124 with a clear message.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Restrict cleanup to containers of the image under test without the
rbd-test-run label and ignore NotFound.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
container-structure-test left one anonymous volume per test container.
tests/structure.py runs it with --save and removes the new containers
with their volumes afterwards.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>