Update stored digests in Release

During a release, the docker images are build and published, but the stored digests are not updated according to the current version of the base containers. Meaning, we could have a released image with base container v2, but the digest still points to v1. In this case, our docker images would be rebuild and re-released the next day (because of `.github/workflows/scheduled-security-updates.yml`).

Digest should be updated during the release workflow to avoid redundant re-publishing