feat: Logging installed pnpm version

[djmurphy32]

This resolves #238

Summary by CodeRabbit

• New Features
  • Installer now logs "Installed pnpm version: …" for clearer feedback after setup.
  • When a target version is specified, the installer reports that version; otherwise it reports the computed bootstrap version.
  • Generated package metadata during bootstrap is produced more consistently.

[coderabbitai]

📝 Walkthrough

Walkthrough

Bootstrap package.json creation now uses object constants for the embedded pnpm / @pnpm/exe packages, writes them via JSON.stringify, computes the bootstrap version from lockfile/standalone mode, and logs the installed pnpm version with @actions/core.info (preferring targetVersion when provided).

Changes

Bootstrap Package JSON Refactor & Version Logging

Layer / File(s)	Summary
Imports src/install-pnpm/run.ts	info added to @actions/core imports for logging.
Data Shape src/install-pnpm/run.ts	Introduce object constants BOOTSTRAP_PNPM_PACKAGE and BOOTSTRAP_EXE_PACKAGE (object-typed package.json contents) instead of pre-stringified JSON.
Core Implementation src/install-pnpm/run.ts	Select the appropriate bootstrap package object based on standalone/lockfile mode; derive bootstrappedVersion from that selection.
IO / Wiring src/install-pnpm/run.ts	Write bootstrap package.json using JSON.stringify(packageJson) rather than writing a pre-serialized string.
Logging src/install-pnpm/run.ts	After optional pnpm self-update, call info to log Installed pnpm version: ${targetVersion ?? bootstrappedVersion}.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I hop through JSON, tidy and spry,
Objects bloom where strings used to lie,
A version's whispered, soft and bright,
Target or bootstrap — all set right. 🐇✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title 'feat: Logging installed pnpm version' accurately describes the main change: adding logging for the installed pnpm version using improved version tracking and @actions/core info logging.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/install-pnpm/run.ts`:
- Around line 29-30: The code computes installedVersion up front (const
installedVersion = standalone ? BOOTSTRAP_EXE_PACKAGE.dependencies['@pnpm/exe']
: BOOTSTRAP_PNPM_PACKAGE.dependencies.pnpm) but later may perform a self-update
to targetVersion and still logs the original installedVersion; update the logic
so the logged version is determined after any self-update: either set a new
variable (e.g., loggedVersion) to targetVersion when the self-update path (the
code that uses targetVersion) runs, or recompute/read the actual installed
package version from the written package.json/installed metadata before logging;
adjust uses in run.ts to reference this post-update value instead of the
original installedVersion.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: c34c81ae-ba17-47fe-b9aa-00426ad1e855

📥 Commits

Reviewing files that changed from the base of the PR and between 8912a91 and e710aca.

⛔ Files ignored due to path filters (1)

• dist/index.js is excluded by !**/dist/**

📒 Files selected for processing (1)

• src/install-pnpm/run.ts