1) EXPOSE 3000 in Dockerfile + set loadbalancer port to 3000 in docker-compose.yml
2) Add reference to a manually installation of osm2pgsql
3) Add -W to osm2pgsql, which asks for the postgres password
4) Added the manual creation of the docker network `gateway`
5) Changed deployment order: build portal -> prepeare database -> import Osm -> run the container
6) Add localhost binding of postgres to docker-compose.yml (optional)
