Review fixes for the comment workflow. Artifacts are downloaded by name
for the exact attempt that finished, and for the baseline run's latest
attempt, since a rerun keeps earlier attempts' artifacts under the same
run. Every lookup prints nothing instead of failing, so no quattro
baseline yet, an expired one, or a missing boot file shows as "–"
rather than ending the script under set -e before any comment. The
install test's own marker step takes ownership of test-runs first,
which the harness created as root inside its container.
Emir Beganovic
89a34f7885