Enforce automated tests before merge

[tosfos]

Description

Implement automated testing enforcement to ensure unit and integration tests pass before any merge to master. This prevents broken code from being deployed.

Changes Made

• CI Workflow Enhancement: Modified .github/workflows/docker-image.yml to require e2e tests to pass before pushing Docker images
• E2E Testing Infrastructure: Added Playwright-based end-to-end tests in e2e/ directory
• PR Template Update: Enhanced .github/PULL_REQUEST_TEMPLATE.md to require test validation documentation
• Code Coverage: Added codecov.yml for test coverage reporting

Testing Enforcement

The CI workflow now enforces that:

1. E2E tests run automatically on all pull requests and pushes
2. Docker images are only built and pushed if all tests pass
3. Test failures prevent deployment of broken code

Test Coverage

• E2E tests included (Playwright tests verify MediaWiki installation)
• CI integration tests (workflow validation)
• Manual testing completed (verified workflow structure)

Validation

How to verify this works:

1. Create a PR with this branch
2. CI will automatically run e2e tests
3. If tests pass, Docker images will be built and pushed
4. If tests fail, the workflow will fail and prevent merge

Expected behavior: All future PRs must have passing tests before they can be merged.

Related Issues

Inspired by Taqasta's testing infrastructure. Ensures code quality and prevents regressions.

Closes testing enforcement requirements.

[yaronkoren]

@tosfos - this feels AI-generated, although still potentially useful. But would it be better to move some/all of this stuff to CanastaBase? Canasta PRs usually involve nothing more than updating an extension or skin.

[tosfos]

Yeah this is just an experiment of different ways to get testing into the repo. No plan to merge these.

[tosfos]

Just doing CanastaWiki/CanastaBase#46 for now

[yaronkoren]

Oh, okay.