docs: add e2e test documents

[fangpenlin]

Description 📣

https://linear.app/infisical/issue/PLATFRM-138/update-document-for-testing

Type ✨

• Bug fix
• New feature
• Improvement
• Breaking change
• Documentation

[greptile-apps]

Greptile Overview

Greptile Summary

This PR adds comprehensive documentation for the e2e testing framework for the CLI project. The document covers:

• Test execution methods: Explains two approaches (subprocess and functionCall) for running CLI tests, including their benefits and drawbacks
• Environment setup: Details required environment variables (INFISICAL_BACKEND_DIR, INFISICAL_CLI_EXECUTABLE, CLI_E2E_DEFAULT_RUN_METHOD)
• Test execution: Provides complete examples of how to build and run the e2e tests
• Troubleshooting guides: Includes sections for debugging CLI errors and backend API errors, with practical examples
• Performance optimization: Documents the compose container cache system to speed up development iterations

The documentation is well-structured and provides helpful context for developers working with the e2e test suite. Two minor issues were found: a spelling error and a duplicate section title that could cause navigation confusion.

Confidence Score: 4/5

• This PR is safe to merge with minimal risk - it only adds documentation with no code changes.
• The PR adds a new documentation file with no code changes, making it very low risk. The confidence score is 4/5 (not 5/5) due to two minor issues: one spelling error ("behaivor" → "behavior") and duplicate section titles that could confuse readers. These are easily fixable and don't impact functionality.
• No files require special attention - this is a documentation-only change with minor typos.

Important Files Changed

File Analysis

Filename	Score	Overview
e2e/README.md	4/5	New documentation file for e2e tests. Found one typo ('behaivor') and one duplicate section title that should be clarified.

[greptile-apps]

_{2 files reviewed, 2 comments}

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