Merge branch 'dockerfile' into 'master'

add dockerfile stub

See merge request dynamicexposure/server-components/containers/docker-obm-engine!1

Dockerfile

+FROM python:3
+
+ARG APP_NAME=the-engine
+ARG HOME="/app"
+
+RUN pip install git+https://gitext.gfz-potsdam.de/dynamicexposure/openbuildingmap/the-engine
+
+ADD . ${HOME}/${APP_NAME}
+WORKDIR ${HOME}/${APP_NAME}
+
+CMD [ "the-engine" ]
+