After trying to run trivy using CircleCI based on the sample configuration and failing, I want to suggest the following updates:

* `docker:18.09-git` no longer exists and causes workflow to fail, replaced with `stable-git` instead.
* added  `setup_remote_docker` or else the docker commands fail in the rest of the execution, as per https://circleci.com/docs/2.0/building-docker-images/#overview

Co-authored-by: Teppei Fukuda <knqyf263@gmail.com>