fix: container id assert expects /docker/ prefix

This MR introduces:

• container id assert expects /docker/ prefix

src/metric-generators/dockermon.sh

@@ -20,7 +20,7 @@ for i_container in ${CONTAINERS}; do
   i_container_id="/docker/$(echo "${i_container_status}" | jq -r '.[].Id')"
   test -n "${i_container_name}"
   echo -n "${i_container_restart_count}" | grep -Eq "^[0-9]+$"
-  echo -n "${i_container_id}" | grep -Eq "^[a-fA-F0-9]{12,}$"
+  echo -n "${i_container_id}" | grep -Eq "^/docker/[a-fA-F0-9]{12,}$"
   CONTAINER_IDS+=("${i_container_id}")
   CONTAINER_NAMES+=("${i_container_name}")
   CONTAINER_RESTART_COUNTS+=("${i_container_restart_count}")