arm64 images contain no browsers

[MikeMcC399]

Issue

• As discussed in Add Arm browsers to linux/arm64 Docker images #695 cypress/browsers and cypress/included Docker images for linux/arm64 do not ship with the Chrome, Firefox and Edge browsers that the linux/amd64 images ship with. The reason is the lack of availability of each of these browsers for the linux/arm64 environment.

• For linux/arm64, the cypress/browsers image adds no content that is not already in cypress/base. The images are identical.

• This lack of content is not mentioned in the local README documentation or the Docker Hub documentation. (There is mention in CONTRIBUTING > Multi-Architecture Support, however this is not a document that regular users would expect to need to consult.)

Suggestion

Documentation should correctly describe the content of Cypress Docker images, also for linux/arm64 variants.

[MikeMcC399]

• PR docs: add platform information #1131 adds documentation to enable this issue to be closed.