Summary

This quickfix PR will add a starting point for cross-browser testing as part of our end-to-end test workflow.

Changes

• Change workflow logic to pass build files using artifacts instead of (verbose) repeated caching
• Use a build of the stack rather than running the stack on go to avoid setting up go in job's that run the end-to-end tests, and to avoid having to cache go modules
• Add a job that runs the smoke tests on Firefox 78 (ESR)

Testing

Tested this on my private fork.

Notes for Reviewers

The smoke tests on firefox will currently fail until #4559 is merged.

I think the old Firefox 78 is a good testing choice since it is preinstalled on many Ubuntu distributions. Cypress currently supports testing on chromium-based browsers, as well as Firefox. I don't think it is worth testing on any other chromium-based browser, since it effectively runs like Chrome itself. For now, we can hope that Cypress will support Safari and IE in the future and additionally do some manual testing on staging on these browsers.

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.