exclude "scratch" from the default latest check #1613 #1640
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By default, in a docker FROM statement, if no tag is specified, it is treated as the :latest tag. This is flagged by rule AC_DOCKER_0041, but the current rego implementation of the rule erroneously includes the case when the FROM references the special reserved 'image' - "scratch" - ref https://hub.docker.com/_/scratch This PR ensures FROM scratch is not flagged.