Scan for security issues in latest stable release

[dholbach]

It'd be great to periodically (weekly?) scan the latest stable release for security issues and file an issue if necessary automatically.

[rtcms]

I would like to contribute to this, but I have a few questions:

• What kind of security checks are you looking for (e.g. dependencies, container image scans, code scanning)?
• Do you have any preferred tools in mind (Trivy, Snyk, GitHub CodeQL, etc.)?
• Should the scans run via GitHub Actions on release, on a schedule?