Save system test screenshots in GitHub Actions

[jywarren]

Fixes #0000 (<=== Add issue number here)

Make sure these boxes are checked before your pull request (PR) is ready to be reviewed and merged. Thanks!

• PR is descriptively titled 📑 and links the original issue above 🔗
• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with rake test
• code is in uniquely-named feature branch and has no merge conflicts 📁
• screenshots/GIFs are attached 📎 in case of UI updation
• ask @publiclab/reviewers for help, in a comment below

We're happy to help you get this ready -- don't be afraid to ask for help, and don't be discouraged if your tests fail at first!

If tests do fail, click on the red X to learn why by reading the logs.

Please be sure you've reviewed our contribution guidelines at https://publiclab.org/contributing-to-public-lab-software

Thanks!

[gitpod-io]

[codeclimate]

Code Climate has analyzed commit f8303e3 and detected 0 issues on this pull request.

View more on Code Climate.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@4756f69). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head d4ccb72 differs from pull request most recent head f8303e3. Consider uploading reports for the commit f8303e3 to get more accurate results

@@           Coverage Diff           @@
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  Coverage        ?   49.13%           
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  Files           ?       98           
  Lines           ?     6122           
  Branches        ?        0           
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  Hits            ?     3008           
  Misses          ?     3114           
  Partials        ?        0           

[jywarren]

Yay!