Ubuntu rootfs Downloader

[KendallHarterAtWork]

Summary

If merged this pull request will add a plugin that automatically downloads and extracts rootfs files from Ubuntu for ELF files based on the architecture.

[nightlark]

Let's just call the plugin rootfsmanager (+ rename folder/files/README description) to match the class name used. Thinking about how this could be used, I'd also be inclined to remove the surfactantplugin- prefix from the name; I could imagine there being some interest in using it outside of surfactant.

[github-actions]

✅ No SBOM Changes Detected

_{For commit 3c5001e (Run 28956768548)
Compared against commit 94e966e (Run 28537759591)}

[nightlark]

Some notes on other places we can acquire a rootfs from:

• Alpine (musl) "equivalent" of Ubuntu oci: https://dl-cdn.alpinelinux.org/alpine/ has minirootfs tar files under paths like https://dl-cdn.alpinelinux.org/alpine/v3.<x>/releases/<arch>/alpine-minirootfs-<ver>-<arch>.tar.gz
• Void Linux publishes rootfs images for musl and glibc at https://repo-default.voidlinux.org/live/current/, unlike alpine which uses busybox, void linux is maybe more similar in their userspace binaries to a desktop distro like debian
• https://images.linuxcontainers.org has rootfs images for a variety of distros (not particularly minimal like some of the ones aimed at using for OCI container images)
• https://github.com/debuerreotype/docker-debian-artifacts has some rootfs things from Debian
• Arch Linux publishes a bootstrap tarball and has instructions for creating a chroot from it https://wiki.archlinux.org/title/Install_Arch_Linux_from_existing_Linux
• Dumping from any Docker container: podman create --name tmp alpine:3.21 && podman export tmp | gzip > alpine-rootfs.tar.gz
• Docker images for openwrt rootfs? https://github.com/openwrt/docker-openwrt/pkgs/container/rootfs (sorta getting into embedded Linux filesystems... reminds me that eventually support should be added to recognize what OS a filesystem dump is using e.g. /etc/os-release files and package manager metadata files)