feat: add arm64 support and use a non-root path (#4)

- Introduce a GitHub Actions workflow for testing on push and PR.
- Improve Coder binary setup to support both ARM64 and AMD64.
- Ensure binaries are installed in local bin directory.
- Update path configuration to include Coder binary location.

feat: add arm64 support and use a non-root path (#4)

- Introduce a GitHub Actions workflow for testing on push and PR.
- Improve Coder binary setup to support both ARM64 and AMD64.
- Ensure binaries are installed in local bin directory.
- Update path configuration to include Coder binary location.

fix formatting