As a card-carrying librarian, I recommend using Zotero as a client with a WebDAV backend (I use Nextcloud).
If you’re studying or writing anything in which you need to cite your sources, Zotero is excellent and has integrations with many word processors. I’m pretty sure it can output your references as BibTeX if you’re in one of the disciplines that uses LaTeX.
I use What’s up Docker (https://github.com/getwud/wud) for this. It talks to the Docker daemon, is configured with labels. I get notifications when new versions and I can also look at a dashboard that aggregates all the updates and provides links to release notes.
Admittedly, I don’t use Kubernetes, so I can’t tell you whether What’s up Docker supports it. A bunch of docker compose files is enough for me.
It can also update docker compose files with new tags for you, but I’m allergic to auto updates