Building custom ARM docker images

You're moving pretty far along without having persistent storage yet. Seems like there is a lot to revisit now to fix.

Just use this to build multiple container architectures. It builds all architectures at once and pushes them to your image repository. It also works for s390x and ppc64le. Yes, it is experimental but it works great.
"docker buildx build --platform linux/arm/v7,linux/arm/v8,linux/arm64,linux/amd64 --push --tag <container tag> ."