Be aware that the standalone image isn’t recommended for production. And it doesn’t have the best characteristics of a cluster with multiple nodes(instances).
Firstly, to make it work you have to do your own standalone image. Cuz the Bulkloader won’t work with a Live cluster. So you have to add a script to check if the bulkload has finished - like “wait-for-It.sh”. So after the bulk load the Alpha instance can start.
This happens, probably because you are trying to start a second Alpha inside the container. The standalone image has an Alpha and a Zero instance that runs automatically.