ci: Try really hard to print final result string

a630 has been completing jobs, and then corrupting the very last line of
UART output - the one where we pass the overall result back from the DUT
to the job. The bare-metal monitor will wait for this line to appear,
never see it, and then the job times out.

Since this line is the most critical one of all to get out, just spam
the prints to try to make sure they get through.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26032>

.gitlab-ci/common/init-stage2.sh

@@ -216,7 +216,11 @@ fi
 [ ${EXIT_CODE} -eq 0 ] && RESULT=pass || RESULT=fail
 
 set +x
-echo "hwci: mesa: $RESULT"
-# Sleep a bit to avoid kernel dump message interleave from LAVA ENDTC signal
-sleep 1
+
+# Print the final result; both bare-metal and LAVA look for this string to get
+# the result of our run, so try really hard to get it out rather than losing
+# the run. The device gets shut down right at this point, and a630 seems to
+# enjoy corrupting the last line of serial output before shutdown.
+for _ in $(seq 0 3); do echo "hwci: mesa: $RESULT"; sleep 1; echo; done
+
 exit $EXIT_CODE