Create dart.yml

[Mhassanbughio]

Description

Replace this paragraph with a description of what this PR is doing. If you're modifying existing behavior, describe the existing behavior, how this PR is changing it, and what motivated the change. If you're changing visual properties, consider including before/after screenshots (and runnable code snippets to reproduce them).

Related Issues

Replace this paragraph with a list of issues related to this PR. Indicate which of these issues are resolved or fixed by this PR.

Checklist

Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]). This will ensure a smooth and quick review process.

• I signed the CLA.
• All tests from running flutter test pass.
• flutter analyze does not report any problems on my PR.
• I am willing to follow-up on review comments in a timely manner.

[google-cla]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

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[jamesderlin]

Your PR has no description that explains what the motivation for this change is. I'm not familiar with GitHub actions; II assume the intention is to replace tool/travis.sh? If so, do we need to? It seems that it is not easy to run GitHub actions locally, which I consider to be a significant disadvantage.