Add Android UI Screenshot Tests to GitHub CI

[asder8215]

We should have screenshot testing setup within our .github/workflows/android.yml file, so that we can run our Android screenshot tests on push or pull to the main or dev branch.

It's important to be able to automate testing for visual changes (like error outline on input boxes) or see if the app looks good across multiple different android devices + sizes.

[NasarIqbal]

I’ll work on this issue.
Plan:

Add a basic screenshot test for a core screen

Integrate it into the existing GitHub Actions workflow

Document how to update snapshots

Let me know if there’s anything you’d prefer done differently.

[asder8215]

Sure, @Megadash452 and I would be happy to see you make a PR for this issue.

And the plan sounds good to me. As for documenting how to update snapshots, I think having a TESTING.md file would be good to have in the root folder of this repo (right with CONTRIBUTING.md and README.md`).

I'll probably make a GitHub issue for this tomorrow, but in the TESTING.md file, we should discuss conventions and approaches to making tests for unit testing and UI tests (semantics and snapshot tests separately).

Thanks for taking on this issue!