Port CI to GitHub Actions and remove CircleCI

[simonw]

Port CI to GitHub Actions and remove CircleCI configuration.

• Add GitHub Actions workflow:

  • Create .github/workflows/ci.yml to handle CI for pushes and pull requests.
  • Define workflow to run on push and pull request events for the main branch.
  • Include steps for checking out code, setting up Python, installing dependencies, setting up the database, running tests, and storing artifacts.

• Remove CircleCI configuration:

  • Delete .circleci/config.yml.

• Update README.md:

  • Remove CircleCI badge.
  • Add GitHub Actions badge.

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For more details, open the Copilot Workspace session.

[simonw]

Neat, the GitHub Actions CI passed the tests: https://github.com/simonw/simonwillisonblog/actions/runs/9864774305/job/27240407549?pr=464

I'll bump some of the actions versions and then land this.

[simonw]

I unfollowed the project in CircleCI.