feat: support env option

[9aoy]

Summary

Support custom environment variables via env option, which can be available on process.env during testing.

import { defineConfig } from '@rstest/core';

export default defineConfig({
  env: {
    PRINT_LOGGER: 'true',
  },
});

After setting the above configuration, you can access the PRINT_LOGGER variable in your tests:

import { describe, it } from '@rstest/core';

if (process.env.PRINT_LOGGER === 'true') {
  console.log('PRINT_LOGGER is enabled');
}

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR adds support for custom environment variables through a new env configuration option, allowing users to define custom environment variables that will be available via process.env during test execution.

• Adds env configuration option of type Partial<NodeJS.ProcessEnv>
• Implements environment variable setup in the worker runtime
• Adds comprehensive documentation for both English and Chinese locales

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/core/src/types/config.ts	Defines the new env configuration option type
packages/core/src/types/worker.ts	Adds env to the runtime configuration type
packages/core/src/config.ts	Sets default empty object for env configuration
packages/core/src/pool/index.ts	Passes env configuration to runtime config
packages/core/src/runtime/worker/index.ts	Implements environment variable setup logic
website/theme/components/ConfigOverview.tsx	Updates UI to include env in runtime configuration group
website/docs/en/config/test/env.mdx	Adds English documentation for the new option
website/docs/zh/config/test/env.mdx	Adds Chinese documentation for the new option
website/docs/en/config/test/_meta.json	Updates English navigation metadata
website/docs/zh/config/test/_meta.json	Updates Chinese navigation metadata
e2e/env/index.test.ts	Adds end-to-end test for environment variable functionality
e2e/env/fixtures/rstest.config.ts	Test configuration demonstrating env usage
e2e/env/fixtures/index.test.ts	Test case verifying environment variable access

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