tag normalization
Close #24 (closed)
Makes the Docker template being able to use tags that don't comply to the standard syntax (contain forbidden characters) by normalizing the tag (sluggify) (see issue description).
For instance use $CI_COMMIT_TIMESTAMP:
2022-04-16T11:28:00+00:00 becomes 2022-04-16T11-28-00-00-00
Edited by Pierre Smeyers