feat: add support for pnpm

[codfish]

This PR updates how the additional-packages input is handled so the action no longer fails based on the package manager your app uses. Instead of installing additional packages into the working directory (/github/workspace), they are now installed in the script directory.

This approach works because semantic will resolve plugins from both locations.

Previously, installing into the working directory meant we were interfering with the app’s package manager, which caused errors like:

@thomasv314

[Copilot]

Pull Request Overview

This PR adds support for multiple package managers (npm, yarn, pnpm) by detecting which one to use based on lockfile presence in the working directory. The implementation automatically selects the appropriate package manager and uses the correct installation commands for each.

• Adds package manager detection logic based on lockfile presence
• Updates package installation to use detected package manager with appropriate flags
• Installs pnpm globally in the Docker container to support all three package managers

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
entrypoint.js	Implements package manager detection and updates installation logic to support npm, yarn, and pnpm
Dockerfile	Adds global pnpm installation to support pnpm package manager

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Comments suppressed due to low confidence (1)

entrypoint.js:1

• This large block of commented code should be removed. If this functionality is needed, it should be implemented properly rather than left as commented code.

import * as childProcess from 'child_process';

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[github-actions]

🎉 This PR is included in version 4.0.1 🎉

The release is available on GitHub release

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