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I would like to set some setting parameter (such as S3 parameter) by using env variable instead of GUI, is it possible and where I can find the name of the ENV for this ?

Piece of cake.

Simply take any of the settings that you can see, capitalise it to keep things consistent, add DISCOURSE to it, and link it all up with _'s (underscores).

You then put this in app.yml before the volumes: section, indenting it exactly (usually with 2 spaces) as the other environmental settings in there.

For example:

  DISCOURSE_BACKUP_LOCATION: 's3'

안녕하세요. 이 기능이 모든 Site 설정 구성에 적용되나요? 예를 들어 Discourse Connect에서도 작동하나요?

그렇습니다. DiscourseConnect는 핵심 기능이니까요(다만, 플러그인 설정도 설정할 수 있다고 생각합니다).