improvement: add e2e tests poc

[fangpenlin]

Description 📣

ref: https://linear.app/infisical/issue/PLATFRM-125/update-the-current-poc-with-design-doc-feedbacks

Type ✨

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

Tests 🛠️

# Here's some code block to paste some code snippets

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[greptile-apps]

Greptile Summary

• Introduces comprehensive end-to-end testing infrastructure for Infisical CLI with Docker Compose orchestration, automated client code generation, and relay functionality testing
• Modifies CLI command execution pattern to support better testing by returning errors instead of calling os.Exit(1) and adding context-aware execution
• Adds automated OpenAPI client generation with endpoint filtering for focused E2E testing using oapi-codegen and proper Makefile automation

Important Files Changed

Filename	Overview
e2e/relay/relay_test.go	New comprehensive E2E test validating relay registration and heartbeat communication with proper Docker environment setup
main.go	Updated main function to properly handle command errors and exit with status code 1 on failures
packages/relay/relay.go	Added graceful shutdown handling with net.ErrClosed checks to support clean relay termination in tests
e2e/packages/client/provisioner.go	New provisioner for bootstrapping test environments with admin accounts and tokens; contains error message bug on line 83
e2e/compose.yaml	Docker Compose configuration using hardcoded credentials suitable for testing but lacking health checks

Confidence score: 4/5

• This PR implements a well-structured E2E testing framework with comprehensive Docker orchestration and proper abstraction layers
• Score reflects one bug found in error handling (wrong variable in error message) and some security considerations around hardcoded test credentials
• Pay close attention to e2e/packages/client/provisioner.go line 83 where the error message uses wrong response variable

[greptile-apps]

_{16 files reviewed, 7 comments}

_{Edit Code Review Agent Settings | Greptile}

[akhilmhdh]

This should be stdout right?

[fangpenlin]

Nope, stdout is ually for output data or result of the cmd. Usually people use stderr to output the logs or system info. We are using stderr to output the logs, so this is actually correct.

[akhilmhdh]

Interesting!