I like tests. Recent convert (well, ~7 years).
Behat and Mink were a testing revelation for me in the PHP development days - user readable tests that also ran as PHP testing code. Genius. At work there's a project we're using Cypress for UAT (being more user friendly than Selenium); and I wanted to similarly have user readable test cases. Cypress has an (unofficial) Cucumber preparser. To make it easy for everyone, having a Docker container where it's all built in makes sense to me.
I've just published my Cypress-Cucumber Test Container onto Github. Let me know how it goes for you.