This patch adds a sidecar container to Jellyfin, which manages a PDB for Jellyfin. It automatically blocks disruptions when at least one device is playing some media. This makes Jellyfin resistant to updates and other actions in the cluster that might voluntarily evict the Jellyfin Pod.
Currently it's built to react within 15 seconds.
In order to use this component one has to create an API key in Jellyfin and provide it in a secret called `jellyfin-pdb-mgr` in a key called `token`.
