The official, maintained repository is https://github.com/it-at-m/dependabot-gitlab-openshift. This repository is no longer maintained.
Slightly modified Docker image build of dependabot-gitlab to allow running the image in OpenShift.
See https://hub.docker.com/r/eidottermihi/dependabot-gitlab-openshift/tags
Refer to the official docs of dependabot-gitlab.