Run vulnerability checks in the images we have published

### Description

We currently have a workflow to run trivy when we want to publish new images https://github.com/Altinn/altinn-platform/blob/main/.github/workflows/reusable-image-scan-and-release-ghcr.yml. We don't, however, run checks to make sure our latest published images do not have vulnerabilities.

We should add a check for those.

P.S: I don't think we have public facing images and with renovate updating our dependencies, I don't think this is too critical for us. Should be an easy one to do anyways.

### Additional Information

_No response_