what should I do here? Host the product pack using a webserver

[ssa7090]

I tried to install Dockerfile for WSO2 API Manager using the guide in github for the version Docker image for WSO2 API Manager 4.2.0.
But I don't know what i exactly should do in point 2 at Build the Docker Image. I saved the zip file local on my pc, unzipped it and then I copied the unzipped folder to the virtual machine, where I should install the gateway. Now I don't know, what is meant with host the product pack using a webserver. And for the last point "Change <APIM_DIST_URL> in Dockerfile to the URL of the product pack." I don't hava a parameter APIM_DIST_URL in my Dockerfile.

I would appreciate any answer, how I can go on.