Merge branch 'eero/cleanup-builds-5-point-5' into 'master'

Userspace LVM tools

Create tooling to build LVM images in userspace, by building and writing the disk information directly. This removes the need for any privileges when building HostOS, and clears out a few points of non-determinism (`lvm` tools use the kernel, and write metadata about the builder that can't be disabled or easily faked.).

Based on https://github.com/libyal/libvslvm/blob/main/documentation/Logical%20Volume%20Manager%20(LVM)%20format.asciidoc and https://github.com/lvmteam/lvm2 

See merge request dfinity-lab/public/ic!11361

toolchains/sysimage/build_disk_image.py

@@ -137,7 +137,7 @@ def main():
         "partitions",
         metavar="partition",
         type=str,
-        nargs="+",
+        nargs="*",
         help="Partitions to write. These must match the CSV partition table entries.",
     )