unity-setup@v2.3.0

[StephenHodgson]

• add cache-installation input option to use GitHub actions cache to store installation for faster setup

[Copilot]

Pull request overview

This PR adds caching functionality to the Unity setup action to speed up workflow runs by caching Unity Editor installations. The implementation introduces a new cache-installation input option that leverages GitHub Actions cache to store and restore Unity installations between workflow runs.

Key changes:

• Restructured the main workflow to support setup and post-execution phases for cache save operations
• Added cache key generation based on platform, Unity versions, and modules
• Integrated cache restore during setup and cache save during post-execution cleanup

Reviewed changes

Copilot reviewed 7 out of 11 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
src/index.ts	Restructured main logic to support setup/post phases, added cache key generation, cache restore/save operations, and installation path validation
action.yml	Added cache-installation input parameter and configured post-execution hook
package.json	Bumped version to 2.3.0 and updated dependencies (@rage-against-the-pixel/unity-cli to 1.8.1, @types/node to 22.19.3)
package-lock.json	Updated lock file to reflect dependency version changes
README.md	Documented the new cache-installation input option with usage note
.github/workflows/validate.yml	Updated actions/checkout to v6
.github/workflows/update-release-tags.yml	Updated actions/checkout to v6
.github/workflows/build.yml	Updated actions/checkout to v6, updated free-disk-space action version, repositioned runs-on, removed top-level permissions, and fixed trailing whitespace
dist/sourcemap-register.js	Removed entire file (build artifact)
dist/licenses.txt	Removed entire file (build artifact)

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