* Update Jenkinsfile

Signed-off-by: Christopher Guindon <chris.guindon@eclipse-foundation.org>

* Move copy cmd before npm install

use npm ci instead of npm install for reliable builds.

Signed-off-by: Christopher Guindon <chris.guindon@eclipse-foundation.org>

* syncronize changes with gitlab dockerfile

Signed-off-by: Christopher Guindon <chris.guindon@eclipse-foundation.org>