Add Firefox to Linux/arm64 CI Cypress Docker usage

[MikeMcC399]

Situation

Cypress Docker images for the Linux/arm64 platform include Firefox >= 136.0.2 , see cypress-io/cypress-docker-images > README:

• cypress/browsers:node-22.14.0-chrome-134.0.6998.88-1-ff-136.0.2-edge-134.0.3124.68-1
• cypress/included:cypress-14.2.0-node-22.14.0-chrome-134.0.6998.88-1-ff-136.0.2-edge-134.0.3124.68-1

Continuous Integration > Cypress Docker Images > Cypress Docker Variants is now outdated, as it states:

Currently Linux/arm64 images do not contain browsers.

Change

Modify the text in https://github.com/cypress-io/cypress-documentation/blob/main/docs/app/continuous-integration/overview.mdx#cypress-docker-variants to introduce Firefox 136.0.2 and above to cypress/browsers and thus also to cypress/included Cypress Docker images.

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[MikeMcC399]

Preview

https://github.com/MikeMcC399/cypress-documentation/blob/add/docker-arm64-firefox/docs/app/continuous-integration/overview.mdx#cypress-docker-variants