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Sanitize CI_BUILD_REF_NAME before tagging

username-removed-831082 requested to merge iiska/gitlab-ci-yml:sanitize-docker-image-tag into master

Git branch names allow characters which would be invalid when assigned to a Docker tag. Use tr to replace other than valid characters with a dash -.

Eg. branch feature/new-stuff would become tag feature-new-stuff-

List of valid tag characters is based on this: https://docs.docker.com/engine/reference/commandline/tag/

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