Add support for private container registries

[redhat-openshift-ecosystem]

Add support for private container registries

[jomkz]

That seems reasonable to me. So the work required for this would be to simply output a message in the log if the secret is present. Does anyone have any problem with that?

[acornett21]

Key to be used in CR should be docker-registry when creating the secrete, since this is the value the pipeline uses.

[dcurran90]

/assign

[dcurran90]

This appears to already work as long as the user creates the registry-dockerconfig-secret and runs the following command:
tkn pipeline start operator-ci-pipeline \ --param git_repo_url=$GIT_REPO_URL \ --param git_branch=main \ --param bundle_path=$BUNDLE_PATH \ --param env=prod \ --param pin_digests=true \ --param git_username=$GIT_USERNAME \ --param git_email=$GIT_EMAIL \ --param registry=$REGISTRY \ --param image_namespace=$IMAGE_NAMESPACE \ --workspace name=pipeline,volumeClaimTemplateFile=templates/workspace-template.yml \ --workspace name=kubeconfig,secret=kubeconfig \ --workspace name=ssh-dir,secret=github-ssh-credentials \ --workspace name=registry-credentials,secret=registry-dockerconfig-secret \ --showlog

we can check if the secret exists and log this in the operator but since we aren't creating secrets in the operator itself there isn't a lot for the operator to do

[dcurran90]

I'll open that PR right now so folks can see it.