This image is published in the Docker Hub.
Alternatively you can clone this repository and build the image using the docker build
command.
docker build -t repository/imagename:tag .
The config is set using environments listed below on build.
ENV TIMEZONE America/Sao_Paulo
ENV PHP_MEMORY_LIMIT 512M
ENV MAX_UPLOAD 100M
ENV PHP_MAX_FILE_UPLOAD 200
ENV PHP_MAX_POST 100M
Change it in Dockerfile
and you can rebuild your image.