smolvm v1.2.0

What's Changed

• feat(registry): chunked blob upload for large layers (fix proxy 413) by @BinSquare in #436
• feat(pack): stage on disk-backed cache by default + --staging-dir flag by @BinSquare in #439
• feat(image): make max image-archive size overridable (closes #438) by @BinSquare in #440

Full Changelog: v1.1.3...v1.2.0