Refs #38269 - fix container-image-name validator

Author: m-bucher

app/lib/katello/validators/container_image_name_validator.rb

@@ -8,7 +8,7 @@ def validate_each(record, attribute, value)
       end
 
       def self.validate_name(name)
-        if name.empty? || name.length > 255 || !/\A([a-z0-9]+[a-z0-9\-_.]*)+(\/[a-z0-9]+[a-z0-9\-_.]*)*\z/.match?(name)
+        if name.empty? || name.length > 255 || !/\A([a-z0-9]+([\-_.]*[a-z0-9]+)*)+(\/[a-z0-9]+([\-_.]*[a-z0-9]+)*)*\z/.match?(name)
           return false
         end
         true