This command should install TTRSS successfully on a kubernetes cluster
kubectl apply -f .
Since kubernetes cannot build the containers to run in the pods, I had to build them manually from the official docker-compose repository.
I cloned the original docker compose scripts (https://git.tt-rss.org/fox/ttrss-docker-compose) and modified it to build the individual containers: ajvcorreia/ttrss-app ajvcorreia/ttrss-updater ajvcorreia/ttrss-web_nginx
I had to modify the nginx container to replace the app server name in the nginx.conf on startup as this is only available after kubernetes starts the pod.