Migrate from npm to pnpm

[fityannugroho]

PR Checklist

Please check if your PR fulfills the following requirements:

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• The commit message follows our Contributing Guidelines
• Tests for the changes have been added (optional, for bug fixes or features)
• Docs have been added / updated (optional, for bug fixes or features)

PR Type

What kind of change does this PR introduce?

Please check any kind of changes that applies to this PR using [x]

• Bug fix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes

What is the current behavior?

Please describe the current behavior that you are modifying, or link to a relevant issue.

Issue Number: N/A

Replace npm with pnpm for better performance

What is the new behavior?

This pull request includes several changes to migrate from using npm to pnpm for package management across the project. The most important changes include updates to workflow files, documentation, and the Docker setup.

Workflow updates:

• .github/workflows/pr-tests.yml: Added steps to install pnpm and updated commands to use pnpm instead of npm.
• .github/workflows/tests.yml: Added steps to install pnpm and updated commands to use pnpm instead of npm. [1] [2]

Docker setup:

• Dockerfile: Added installation of pnpm and updated commands to use pnpm instead of npm. [1] [2]
• docker-compose.yml: Updated commands to use pnpm instead of npm.

Documentation updates:

• CONTRIBUTING.md: Updated the command for the automated formatter to use pnpm.
• docs/installation.md: Updated installation steps and commands to use pnpm instead of npm. [1] [2] [3] [4]

Other information

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