Use image name artifact with container scanning

Thiago Figueirórequested to merge
fix-container-scanning-on-master into master

What does this MR do?

Fixes the container scanning job on master builds.

They're currently failing because the image to be scanning is defined as DOCKER_IMAGE=$CI_REGISTRY_IMAGE/$CI_COMMIT_REF_SLUG-$CI_COMMIT_SHA:current. This is not true for master builds.

To simplify things, this MR uses the value of built_image.txt as the DOCKER_IMAGE to be scanned. This is valid for every branch build.

What are the relevant issue numbers?

gitlab-org/gitlab#327071 (comment 571961556)

Tested on master in a fork: https://gitlab.com/thiagocsf-group/demo/dast/-/pipelines/300609890

GitLab Docs MR

Edited by Thiago Figueiró

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