✨ add support for arm architectures

[a-tokyo]

PR Description: PR adds automatic ARM64 architecture detection and support to the action, allowing it to work seamlessly on both x64 and ARM64 GitHub Actions runners.

Changes

Core Changes

• Added getPlatformSuffix() function in src/main.ts to detect platform and architecture

  • Detects ARM64 architectures (arm64, aarch64)
  • Maps to Copilot CLI binary naming convention (-arm64 suffix)
  • Includes graceful fallback with warnings for unsupported architectures

• Updated install() function to use the new platform suffix when constructing download URLs

  • x64: copilot-linux-v1.33.0
  • ARM64: copilot-linux-arm64-v1.33.0

Documentation Changes

• Updated action.yml: Added version input parameter with description
• Enhanced README.md:
  • Added Features section highlighting ARM64 support
  • Added ARM64 usage example
  • Improved overall documentation structure

Build

• ✅ Compiled and bundled using npm run all
• ✅ All tests passing
• ✅ No breaking changes

Testing

Build & Tests

npm run build # ✅ TypeScript compilation successful
npm run package # ✅ Bundle created successfully
npm test # ✅ All tests passing### Compatibility

• ✅ Backwards compatible with existing x64 runners
• ✅ Ready for ARM64 runners (e.g., ubuntu-latest-arm64)
• ✅ No changes required to existing workflows

Example Usage

Before (ARM64 users had to do this manually):

• run: |
  curl --proto '=https' -Lo /tmp/copilot-cli https://github.com/aws/copilot-cli/releases/latest/download/copilot-linux-arm64
  chmod +x /tmp/copilot-cli
  sudo mv /tmp/copilot-cli /usr/local/bin/copilot### After (works automatically on both x64 and ARM64):

• uses: ksivamuthu/aws-copilot-github-action@main
  with:
  command: install## Checklist

• Source code updated (src/main.ts)

• Built and packaged (dist/index.js)

• Documentation updated (README.md, action.yml)

• Tests passing

• No breaking changes

• Backwards compatible

Related Issues

Closes #240