I have successfully setup Kamal in my Rails project (e.g. can build, deploy on so on). I found a container called buildx_buildkit_kamal-local-docker-container0on my local machine:

docker container ls
CONTAINER ID    IMAGE                            COMMAND                     CREATED         STATUS      PORTS    NAMES
7ffe1a06207b    moby/buildkit:buildx-stable-1    "buildkitd --allow-i..."    45 hours ago    Up 45 hours          buildx_buildkit_kamal-local-docker-container0

What's the purpose of this container? I can tell it's in some way related to Docker's BuildKit, but that's about it. I haven't changed the builderin deploy.yml.