Provide Dockerfile for kiweeteam/php-cli-shopware-builder

[xetys]

Hey,

I couldn't find the Dockerfile of the kiweeteam/php-cli-shopware-builder image, which is used by this project to build further images. I would kindly ask to provide it, or even include it as a build step for the Dockerfile in docker/Dockerfile

[tom00]

Hi, thanks for reporting!
There was an invalid default alpine version as the default argument value. I've updated it to alpine 3.15.
Here you can find the available images: https://hub.docker.com/r/kiweeteam/php-cli-shopware-builder/tags