Modify dockerfile not to build the dataexport

[njiddasalifu]

1. When building a docker image, the docker file still take into consideration building the dataexport locally. with the latest setup, this should not happen instead dataexport binaries are pull directly from the central repo with mvn clean install

2. I tried to build a docker image of the openelis backend and noticed it failed at some point during the build, the logs indicated a section trying to pull the dataexport module. I then realized because it took much time to clone and failed, the step is not more mandatory.

[njiddasalifu]

Hi @mozzy11 I want to go ahead and send the fix. thx!

here: #1344