Add Snap Package.

For now :
- using makefile :
$ cd ~/build; make -f ~/src/beremiz_public_dist/Makefile DIST=snap
- build and run of python exemple was tested
- no fieldbus support yet.

#!/bin/bash

CONTAINER=beremiz_public_builder_current

docker start $CONTAINER 
echo exec docker with $*
docker exec $CONTAINER bash -c "build $*"
docker stop $CONTAINER