[Docker] Upgrade to PHP 7.4

[YaatSuka]

Hello,

I'm currently working on a project based on Sylius and downloaded with Docker.

I have checked out on the 1.8 version (which support PHP 7.4) and, for some reasons, I need to upgrade my PHP version to 7.4.

Unfortunately, after changing and pulling the appropriated docker image, updating the version in the Dockerfile and run a docker-compose build, I still have issues because several parts of the Dockerfile are deprecated with this PHP version.

Does anyone know how to fix that?

[alexispe]

Hello,

Maybe this can help you : 1658a57

[olimination]

Checkout also: #536

[lchrusciel]

Hey folks, this should be already fixed on the master branch. We will probably release a new Sylius-Standard in the nearest days.