Hi @webhostingnet,
mkdocs serve should not be used for production sites facing the wide web. Please switch to a "mkdocs build" -> "send static files" -> "deploy using nginx or other safe web server" pipeline.

As for issues concerning docker, portainer or GitOps, I never used them so can't help much. But if the file is not present I would first check if the file is in the container using ls or something else, or maybe the GitOps doesn't have access to /production-docs which contains the mkdocs.yml and it maps an empty path.

You could also try mapping your / or ./ or the home directory, basically some parent directory of the one containing the /production-docs and then use ls to make sure there are any files inside.