Builder

# VFS: Bundle Artifacts

Structure of the JSON file which is embedded in a bundle file to enable easy inspection of filesystem contents. The
artifacts file is always appended at the end of the outer bundle tarball, and is always named `artifacts.json.gz`, to
reflect that it is always gzip-encoded.

The artifacts file specifies the following information for each artifact embedded within the file-system:
- The active compression format.
- The artifact's name (path).
- Several hashes of the artifact's un-compressed contents.
- The artifact's un-compressed size.
- The artifact's compressed size using the active compression format.
- The artifact's compressed-data CRC32 checksum.