Claude/setup GitHub actions x5 d ng

[chrisgreg]

Summary

This PR sets up automated testing and publishing workflows for the FYI library:

• ✅ CI workflow runs tests on push to main and PRs
• 🚀 Publish workflow publishes to Hex.pm on version tags (v*..)
• 📝 Release script automates version bumps and changelog updates
• 📚 CONTRIBUTING.md documents the complete release process

Changes

GitHub Actions Workflows

.github/workflows/ci.yml

• Runs tests on multiple Elixir versions (1.14, 1.15, 1.16) and OTP versions (25, 26)
• Checks code formatting with mix format --check-formatted
• Ensures compilation has no warnings
• Triggers on push to main and on pull requests

.github/workflows/publish.yml

• Triggers on version tags (e.g., v1.0.1, v1.1.0)
• Runs full test suite before publishing
• Publishes to Hex.pm using HEX_API_KEY secret
• Only publishes when you explicitly create and push a version tag

Release Automation

scripts/release.sh

• Automates the entire release process
• Usage: ./scripts/release.sh {patch|minor|major}
• Bumps version in mix.exs
• Updates CHANGELOG.md (moves [Unreleased] → versioned section)
• Creates git commit and tag
• Provides clear next steps

CONTRIBUTING.md

• Complete development setup guide
• Contribution guidelines
• Detailed release process documentation
• Troubleshooting steps

CHANGELOG Updates

• Added [Unreleased] section with HTTP client changes from add http client with retries w0 kj3 #2
• Ready for tracking future changes