test: set defaultBrowser to chrome

[MikeMcC399]

• partially addresses Respond to Electron deprecation in Cypress 16 #1883

Situation

Electron is used as the default browser throughout this repo.

With the release of Cypress 16.0.0 Electron has been deprecated:

Deprecated the Electron browser as a test browser. The Electron browser will be removed in a future major version of Cypress; switch to Chrome or another installed browser to avoid a breaking change when you upgrade. See Migrating away from the Electron browser.

Change

Chrome is the most used browser and is available in GitHub-hosted runners for each operating system, with the exception of ubuntu-24.04-arm, for which it has been requested through actions/runner-images#14567.

Use Firefox for ubuntu*-arm runner images.

For those examples that are not browser-specific, add the Browsers configuration setting defaultBrowsers: chrome.

Remove tests that explicitly specify electron.

This re-applies 68be0d4 from PR #1713.

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Note

Low Risk
Changes affect example projects and CI workflows only, with no production action logic or security-sensitive paths modified.

Overview
Prepares the repo for Cypress 16’s deprecated Electron test browser by standardizing on Chrome in example configs and tightening CI browser choices.

Adds defaultBrowser: 'chrome' to the shared cypress.config.js files across non-browser-specific examples so local and default runs no longer rely on Electron.

In example-basic workflows, passes browser: firefox when the matrix OS is Ubuntu ARM (where Chrome isn’t on the runner image); other runners keep the action default.

In example-docker, drops electron from the browser matrix so Docker jobs only exercise chrome, edge, and firefox (with edge still excluded on ubuntu-24.04-arm).

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