There are a couple of things to cover here:

1. Keep your software/containers up to date. You can subscribe to the GitHub repo and configure it to get notified for new releases and security alerts. Complementary, you can use newteleases.io and/or WUD (What’s Up Docker) and add labels to your docker compose files. Personally, I check the notification once a week and change the version for all minor tools I’m using. If there is a major release (or new Immich version) I read the changelog and update instructions (if it’s the case).

2. For security scans, you use Trivy, but the problem is that you don’t have a centralized overview of your scan results. For this you can use DefectDojo. Depending on the case/threat model, vulnerability management for self-hosted things might be overkill, but highly recommended of you want to learn more about this. It worth mentioning Trufflehog as secrets scanner and sops as a solution to encrypt sensitive data so you can push it to git/SCM.