Merge pull request oracle#2684 from oracle/owls_94991_fix_backport_to_3.3

Backport fix for GitHub issue oracle#2655 (OWLS-94991) to 3.3 release

Author: robertpatrick

operator/src/main/resources/scripts/utils.sh

@@ -548,7 +548,9 @@ function waitForShutdownMarker() {
     if [ -e ${SHUTDOWN_MARKER_FILE} ] ; then
       exit 0
     fi
-    sleep 0.1
+    # Set the SERVER_SLEEP_INTERVAL_SECONDS environment variable in the domain specs in
+    # `spec.serverPod.env` stanza to override the default sleep interval value of 1 second.
+    sleep ${SERVER_SLEEP_INTERVAL_SECONDS:-1}
   done
 }