v0.9.0

v0.9.0

This release is mainly an internal reliability update for the GitHub Action. The action now runs its main update workflow through the Lean-based leanUpdate executable, replacing the previous mix of shell and Node.js logic for several steps.

What's Changed

• Added Lean commands for dependency detection, lean-toolchain updates, dependency updates, and change detection.
• Replaced the old scripts/checkChanges.js implementation with a Lean implementation based on git diff -w.
• Added a dedicated dependency update command that validates legacy_update and runs either lake update or lake -R -Kenv=dev update.
• Improved lean-toolchain handling for projects without dependencies, including clearer support for tagged and nightly Lean releases.
• Switched internal cross-step state to GITHUB_ENV while preserving public action outputs.
• Improved PR text for lean-toolchain updates by showing the full new file content.
• Tightened parsing and validation for action inputs such as update_lean_toolchain, release_kind_to_fetch, legacy_update, and update_if_modified.
• Reorganized the Lean source tree under LeanUpdate and introduced shared helpers for input parsing, GitHub Actions output/environment handling, and wrapper types.

Bug Fixes

• Fixed empty lean-toolchain content being shown in update messages.
• Fixed internal state handling by avoiding GITHUB_OUTPUT for values consumed by later action steps.
• Fixed command argument matching in the leanUpdate entry point.

Migration Notes

No workflow changes are required for existing users.

Invalid values for validated inputs now fail earlier with clearer errors. In particular, legacy_update should be true or false, and update_lean_toolchain should be auto or never.

Full Changelog: v0.8.0...v0.9.0