[Misc] Spread ENV variables so that they are placed just before where they are used so that we can use Docker's build cache as aggressively as possible. Suggestion from Tianon Gravi.
[Misc] Spread ENV variables so that they are placed just before where they are used so that we can use Docker's build cache as aggressively as possible. Suggestion from Tianon Gravi.

xwiki-contrib/docker-xwiki