ci/lava: Add delay before calling lava-test-case
Sleep a bit before executing lava-test-case
to give time for bash to dump shell xtrace messages into
the console, which may cause interleaving with LAVA_SIGNAL_STARTTC
in some
devices like a618.
The same approach worked for LAVA_SIGNAL_STARTRUN
since 3b8d10d2 was merged.
Closes: #6867 (closed)
Edited by Guilherme Gallo