Migrate CI from Travis to GitHub Actions

[mishina2228]

Close #242.

Since June 15th, 2021, the building on travis-ci.org is ceased. This PR migrates CI from Travis CI to GitHub Actions. Here are the details:

• Added Ruby 3.0, 3.1 and Rails 5.2, 7.0 to the matrix

• Increase the timeout value for cuprite to address occasional CI failures

  • I followed the error messages below:

    Ferrum::TimeoutError: Timed out waiting for response. It's possible that this happened because something took a very long time (for example a page load was slow). If so, setting the :timeout option to a higher value might help.

  Ferrum::ProcessTimeoutError: Browser did not produce websocket url within 10 seconds, try to increase `:process_timeout`. See https://github.com/rubycdp/ferrum#customization

[glebm]

Thanks!