Test Suite

[robocoder]

Add Docker setup (Dockerfile. docker-compose.yaml, and test-suite) to test the master and 1.x branches against:

• JSON Wire Protocol, i.e., Selenium 3
• W3C Webdriver Protocol: Selenium 4, ChromeDriver, Geckodriver

[robocoder]

See @mvorisek's PR #114 which added a github workflow for Selenium 2 and 3.

[robocoder]

First objective is passing unit tests. This should identify php version issues quickly.

Second objective is functional testing. This should test against a known working driver.

Third objective is integration testing. The MinkSelenium2Driver is AFAIK still a consumer.

Fourth objective is driver compatibility. With so many drivers, versions, and a living document for the spec, this might be overwhelming, so I'm leaving it for last.

[aik099]

The broken build on 1.x branch was fixed in the #133.