CI: new healthcheck condition for OTA docker deployments

This modification aims to improve health status detection by using PRACH IO as
an indicator of the gNB's status (container is marked as "healthy" when the
PRACH IO value in gNB nrL1_stats.log exceeds 0.0 dB.). The new condition accounts
for scenarios where the container may not exit or produce error codes (e.g.,
“sleep” logs or "error code overflow" messages).

docker/scripts/check-prach-io.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -eo pipefail
+
+test -f /opt/oai-gnb/nrL1_stats.log && grep -oP 'PRACH I0 = \K[0-9.]*' /opt/oai-gnb/nrL1_stats.log | awk '{if ($1 > 0.0) exit 0; else exit 1}'