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Ah, yeah it's a little more confusing because it's using the debootstrap tool (https://wiki.debian.org/Debootstrap) to build the container image filesystem. You can see all the gory logic here: https://github.com/bitnami/minideb/blob/master/buildone and https://github.com/bitnami/minideb/blob/master/mkimage It's a bunch of shell scripting that's not really meant to be interpreted by anyone that isn't a debian expert though, so don't feel bad if it looks really confusing. I think the overall thing is that minideb installs the absolute bare minimum system with debootstrap and even strips out a few essential packages like trusted SSL CAs, etc. If you need anything (including those essential packages) you're meant to just install_packages install them--it's all using the same apt sources and packages as debian.
Yeah in the end distroless is likely always going to be the smallest image, as it really cuts out everything that's not necessary to run your app. You might experiment with taking a debian-slim or minideb image and running it through docker-slim to see if it gets closer to the distroless output: https://github.com/docker-slim/docker-slim