Migrate CI/CD from Travis to GitHub Actions

[RishabhJain2018]

Summary

• Replace Travis CI with GitHub Actions workflows for linting, testing, and package publishing
• Add Codecov upload workflow (replacing Coveralls) and a minimal codecov.yml
• Preserve release behavior: staging branch pushes publish to TestPyPI, git tags publish to production PyPI
• Remove .travis.yml, deploy-staging.sh, and .coveralls.yml; update README badges

Test plan

• Add required GitHub secrets: CODECOV_TOKEN, TEST_PYPI_USERNAME, TEST_PYPI_PASSWORD, PYPI_API_TOKEN
• Register repo on Codecov and confirm coverage upload on this PR
• Verify ci-cd workflow passes (flake8 + pytest) on this PR
• After merge, push to staging to confirm TestPyPI publish
• After merge, tag a release to confirm production PyPI publish
• Disable Travis CI for this repository

Summary by CodeRabbit

Release Notes

• Chores
  • Migrated CI/CD infrastructure from Travis CI to GitHub Actions with automated testing, code quality checks, and package publishing workflows.
  • Implemented codecov integration for enhanced code coverage reporting and branch/pull request tracking.
  • Updated repository badges to reflect new CI/CD platform and coverage tools.
  • Updated development tooling to use Python 3.9.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

This PR migrates the repository's CI/CD infrastructure from Travis CI and Coveralls to GitHub Actions and Codecov. It introduces new workflow files for linting/testing/publishing and coverage reporting, adds codecov configuration, removes legacy Travis/Coveralls setup, and updates documentation and project dependencies accordingly.

Changes

CI/CD and Coverage Infrastructure Migration

Layer / File(s)	Summary
GitHub Actions CI/CD workflow .github/workflows/ci-cd.yml, setup.py	Main workflow triggers on pushes to master/staging, tags, PRs, and manual dispatch. Five jobs: code_quality runs flake8, test runs pytest with coverage output, publish_to_testpypi deploys on staging branch, publish_to_pypi deploys on tag push. Coveralls dependency removed from setup.py.
Coverage upload and Codecov configuration .github/workflows/upload-coverage.yml, codecov.yml	upload-coverage workflow runs after successful ci-cd completion, downloads artifacts, uploads coverage to Codecov with proper PR/commit/branch overrides, and posts commit status. Codecov config specifies branch checks, 70% project target with 80% patch target for PRs, ignored paths, and GitHub checks output.
CI/CD documentation and project updates .github/CI_CD.md, README.md, .pre-commit-config.yaml	New CI/CD guide documents workflows, required secrets, GitHub environments, and release steps. README badges replaced from Travis/Coveralls to GitHub Actions/Codecov. Pre-commit black configuration updated from Python 3.7 to 3.9.

🎯 3 (Moderate) | ⏱️ ~20 minutes

🐰 CI workflows now run swift and free,
With coverage tracking via Codecov's tree,
GitHub Actions keeps the tests aligned,
Release to PyPI with publishing refined,
Travis is gone—now the future's designed! 🚀

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title 'Migrate CI/CD from Travis to GitHub Actions' directly and clearly describes the main change: replacing Travis CI with GitHub Actions for CI/CD workflows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/migrate-to-github-actions

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[RishabhJain2018]

Closing in favor of a new PR with commits attributed to the correct GitHub account (RishabhJain2018).