Migrate to GitHub Actions

[hirosassa]

What is this PR?

TSIA

I added following workflow on GitHub Actions

• yapf formatting check. fix https://github.com/m3dev/gokart/issues/155
• test
• publish to PyPI

[hirosassa]

I think diff is broken...

[hirosassa]

Please review following two files only (other differences are not related to this PR, it's broken)

• .github/workflow/test.yml
• .github/workflow/format.yml

Also, we need to discuss on handling pypi secrets.

[vaaaaanquish]

@hirosassa What do you care about pypi secrets?

No matter whose account secret you use, it cannot be seen by others. Because secret is update only.

OR

We can use oganization secrets:) https://github.blog/changelog/2020-05-14-organization-secrets/

[hirosassa]

@vaaaaanquish Thanks for your comment! I did not know about the spec of github secrets. I'll implement the publish to pypi in this PR.

[hirosassa]

@vaaaaanquish @Hi-king Added publish workflow! Plz review.

[vaaaaanquish]

LGTM