ci: Fix Metricbeat test

The naming scheme of containers created by Compose has changed in V2.

Ref. docker/compose#8655

.github/workflows/scripts/run-tests-metricbeat.sh

@@ -25,7 +25,7 @@ poll_ready "$cid_mb" "http://${ip_mb}:5066/?pretty"
 #   agent.type:"metricbeat"
 #   AND event.module:"docker"
 #   AND event.dataset:"docker.container"
-#   AND container.name:"docker-elk_elasticsearch_1"
+#   AND container.name:"docker-elk-elasticsearch-1"
 #
 log 'Searching a document generated by Metricbeat'
 
@@ -34,7 +34,7 @@ declare -i count
 
 # retry for max 60s (30*2s)
 for _ in $(seq 1 30); do
-	response="$(curl "http://${ip_es}:9200/metricbeat-*/_search?q=agent.type:%22metricbeat%22%20AND%20event.module:%22docker%22%20AND%20event.dataset:%22docker.container%22%20AND%20container.name:%22docker-elk_elasticsearch_1%22&pretty" -s -u elastic:testpasswd)"
+	response="$(curl "http://${ip_es}:9200/metricbeat-*/_search?q=agent.type:%22metricbeat%22%20AND%20event.module:%22docker%22%20AND%20event.dataset:%22docker.container%22%20AND%20container.name:%22docker-elk-elasticsearch-1%22&pretty" -s -u elastic:testpasswd)"
 
 	set +u  # prevent "unbound variable" if assigned value is not an integer
 	count="$(jq -rn --argjson data "${response}" '$data.hits.total.value')"