There is no apparent way to build the docker image, as linked on docker hub

A docker image on docker hub is linked, but no means for building the image provided, nor any dockerfile / source linked from dockerhub.

This should be provided as part of the source repo, both for traceability and for forked repos.

Start by inspecting the repository contents and the Docker Hub image metadata to determine the expected image and its current source. Done means the repository contains the Dockerfile or build source and provides a link or instructions that reproduce the Docker Hub image, including for forked repositories.

Written by the indexing model from the issue text.