Add CI/CD workflows with tox and GitHub Actions for comprehensive testing, styling, and quality checks

[markurtz]

Summary

Implements a series of GitHub Actions workflows and tox environments to streamline the CI/CD processes for the project. It replaces the previous Makefile-based pathways and focuses on modernizing the development, testing, and deployment practices.

Details

• CI/CD Workflows: Introduced multiple GitHub Actions workflows for development, nightly builds, quality checks, and releases.
  • Development Workflow: Runs on pull requests to any branch. Includes unit tests and integration tests for Python versions 3.8 to 3.12.
  • Nightly Workflow: Scheduled to run nightly, ensuring continuous integration health with the unit, integration, and end-to-end tests.
  • Quality Workflow: This runs on pushes to the main branch and pull requests. It ensures code quality with linting, formatting, and type checking.
  • Release Workflow: Triggers on push to release branches, running comprehensive tests to prepare for new releases.
• tox Configuration: Updated tox.ini to define environments for unit tests, integration tests, end-to-end tests, quality checks, style checks, type checks, build, and clean operations.
• Developer Documentation: Expanded DEVELOPING.md to guide contributors in setting up the development environment, running tests, and maintaining code quality.
• README Updates: Updated project documentation to reflect the new CI/CD practices and removed outdated Makefile instructions.

Test Plan

Pending running the new GitHub Actions workflows. If any issues pop up, those will be fixed either in this diff or in subsequent ones.

[parfeniukink]

Nice ✨