Tag Docker image with commit ref slug
Update the tag branch
CI job of the CI configuration shared by the analyzers,
and set the tag of the Docker image to $CI_COMMIT_REF_SLUG
instead of $CI_COMMIT_REF_NAME
,
making possible to tag a Docker image for a branch having a slash in its name.
See gitlab-org/security-products/analyzers/gosec!19 (diffs, comment 263756144)