Improve dev Dockerfile (#1333)
Improve dev Dockerfile (#1333)

* Improve dev Dockerfile

Use Docker best-practices for the development Dockerfile. Save 3Mo.

* Update support/docker/dev/Dockerfile

Co-Authored-By: pichouk <f15ef347848b6b070eb8b0254a585e8cd6785b20@kyane.fr>

Green-Star/PeerTube,Chocobozzz/PeerTube,Chocobozzz/PeerTube,Chocobozzz/PeerTube,Green-Star/PeerTube,Green-Star/PeerTube,Green-Star/PeerTube,Chocobozzz/PeerTube