What does it mean to fork from another image?
Forking from another image allows you to extend the functionality of a pre-made image to better suit your application's needs.
This is useful when you need to add an extra PHP module, binary application or custom configuration.
For example, adding an extra PHP module consists of adding the following line to your
RUN pecl install <module name>
For more information about the
Dockerfile, please read the Dockerfile documentation.