Add GitHub Actions CI workflow

[shyndman]

This pull request introduces a new GitHub Actions workflow to automate continuous integration (CI) for the repository. The workflow sets up Python, installs dependencies, enforces code quality with linting and formatting checks, performs type checking, and runs unit tests on every pull request and push to the main branch.

New CI workflow automation:

• Added .github/workflows/ci.yml to define a CI pipeline that triggers on pull requests and pushes to main.

  • Sets up a Python 3.10 environment with dependency caching.
  • Installs project dependencies along with ruff (for linting/formatting) and basedpyright (for type checking).
  • Runs ruff for linting and formatting checks to enforce code quality.
  • Runs basedpyright for type checking, outputs diagnostics, and fails the workflow on type errors.
  • Runs unit tests using Python’s built-in unittest framework.

This addition ensures that code quality and correctness are automatically validated on each change, helping to prevent regressions and maintain standards.

Agent-Logs-Url: https://github.com/shyndman/ptouch-bt/sessions/691de6e5-6fbb-49d7-9880-a42587ceed61

[Copilot]

Pull request overview

Adds a GitHub Actions CI workflow for this Python package to automatically run quality gates and tests on pushes to main and on pull requests.

Changes:

• Added a CI workflow that sets up Python and installs dependencies/tools.
• Enforced linting + formatting checks via ruff.
• Added type checking via basedpyright and test execution via unittest.

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