Notable Changes

• Builtin Dockerfile frontend has been updated to v1.13.0
• Attestations embedded into build results can now be generated in OCI artifact format with oci-artifact=true option #5573
• Platform specifiers that set Windows OSVersion are now supported #5614
• Add powershell.exe dir to default PATH for WCOW #5446
• Allow unix address for debug address for buildkitd #5568
• Requests that pull in Git sources now inherit proxy environment variables from buildkitd #5613
• Update Runc to v1.2.4 #5639
• Update RootlessKit to v2.3.2 #5674
• Fix possible "unknown file mode" error when transferring files on Windows #5636 #5657
• Fix possible panic from data race in history record serialization #5666
• Fix error message for invalid includepatterns #5649
• Fix invalid index.json annotations on tar=false export #5589
• Fix possible panic when walking provenance due to race condition #5606

See https://gitlab.wikimedia.org/repos/releng/buildkit/-/blob/wmf/v0.15/wmf/README.md for docs on how to update from a new upstream release.

This release includes a fix that blocked us from upgrading to 0.16.0 in T374478