ci: Add CI workflow for Python project

[SoClosee]

This PR adds a GitHub Actions workflow for continuous integration of a Python project. The workflow includes the following steps:

• Cancel previous runs: Ensures that only the latest run is active, canceling any outdated ones.
• Build and test:
  • Runs on Ubuntu-latest.
  • Uses a matrix strategy to test multiple Python versions (3.8, 3.9, 3.10).
  • Sets up the specified Python version.
  • Installs dependencies using pip.
  • Caches Python dependencies for faster builds.
  • Runs unit tests using unittest.
• Deploy:
  • Depends on successful build and test jobs.
  • Runs only if the code is pushed to the main branch.
  • Simulates a deployment step.

This setup ensures efficient testing across multiple Python versions and secure deployments.

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