Build normal and extended versions for the registry images
This MR addresses #29 (closed), !65 (closed) and !66 (closed).
I've tested it with CI/CD in https://gitlab.com/yaegashi/hugo:
- 
https://gitlab.com/yaegashi/hugo/pipelines/59482623 (
updateas a scheduled job) - 
https://gitlab.com/yaegashi/hugo/pipelines/59482792 (
testas commited byupdate.py) - 
https://gitlab.com/yaegashi/hugo/pipelines/59482795 (
testanddeployas tagged0.55.5byupdate.py) - 
https://gitlab.com/yaegashi/hugo/container_registry (contains the following 3 images with 
latestand0.55.5tags)- registry.gitlab.com/yaegashi/hugo (normal version, the same as before)
 - registry.gitlab.com/yaegashi/hugo/hugo (identical to yaegashi/hugo)
 - registry.gitlab.com/yaegashi/hugo/hugo_extended (extended version)
 
 
Edited  by Takeshi Yaegashi