Add separate pub-cache boolean flag

[kuhnroyal]

This allows to selectively enabled/disable SDK & pub dependency caching.
Uses backwards compatible default if only cache: true is set.

Summary by CodeRabbit

• New Features
  • Added a pub-cache configuration parameter to independently control Dart pub dependency caching; when unspecified it falls back to the existing cache behavior.
• Documentation
  • Updated docs to explain pub-cache behavior, usage scenarios, defaults, and dynamic value references.
• Chores
  • CI matrix updated to use macOS-14 in relevant test jobs; cache step now honors pub-cache when provided.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a new pub-cache input to control Dart pub dependency caching independently of cache, updates action step logic to respect pub-cache, documents behavior and fallback rules in README.md, and updates the GitHub Actions matrix to use macos-14 instead of macos-13.

Changes

Cohort / File(s)	Summary
Documentation Update README.md	Documented new pub-cache input, its independent semantics, fallback to cache when unspecified, usage scenarios, and notes about backward compatibility and dynamic value support.
Action Configuration action.yaml	Added new public input pub-cache and changed the "Cache pub dependencies" step condition to run when pub-cache is true or when pub-cache is empty and cache is true.
Workflow Matrix .github/workflows/.../workflow.yaml	Replaced macos-13 with macos-14 in the operating-system matrix for relevant jobs.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hid the pub-cache in a cozy spot,
Separate from cache, yet tidy and hot,
If left unknown, I tumble back in place,
Dart packages snug in their own warm space,
Hop—configuration settled with a happy face.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and concisely describes the main change: adding a separate pub-cache boolean flag for independent pub dependency caching control.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[kuhnroyal]

@bartekpacia Can you please take a look at this?

[bartekpacia]

@kuhnroyal of course - thanks for the ping.

Could you rebase with master and revert changes not directly related to the scope of the PR? see also #387

[kuhnroyal]

@bartekpacia Rebased

[bartekpacia]

Thanks! Looking good.