* expand selenium tests
** fix selenium test for ubl changeLanguage
** add test for performance on result list
** example: docker exec -it selenium_php_1 sh -c "./vendor/bin/steward run de_15/24163 firefox --group performance-static --server-url http://selenium:4444/wd/hub -vvv"
** remove unused and large chrome image

* add finc performance logger for simple time measurement as csv format
* add http debug service for unlogged requests
* need to be uncommented in module.config (also set file name under [Logging])

* Docker
** use image labels to avoid multiple images, container (and build caches) for each instance
** activate OpCache for PHP 8 to increase dev performance

* fix xdebug settings
* fix gd library for dynamic covers
* set php version as variable in .env file
** for local development: copy .env.local to .env
** after changing run "docker-compose build php" or "docker-compose up --build --force-recreate" to start immediately

* also refs 23937