v0.22.0-rc.1

• github: upload artifact by @crazy-max in #308
• buildx: metadata and refs resolution for build and bake by @crazy-max in #314
• util: formatFileSize func by @crazy-max in #313
• buildx: make name opt optional when inspecting builder by @crazy-max in #319
• buildx: remove unused printInspect method by @crazy-max in #306

Full Changelog: v0.21.1...v0.22.0-rc.1