circle: Remove prerelease tag "latest" to avoid confusing "git describe"
circle: Remove prerelease tag "latest" to avoid confusing "git describe"

This will ensure the generated docker image associated with tagged release
will not be named "latest" when both "latest" and "regular release tag"
point to the same commit.

QIICR/dcmqi,QIICR/dcmqi,QIICR/dcmqi,QIICR/dcmqi,QIICR/dcmqi