Add example Dockerfile

Dockerfile

@@ -0,0 +1,27 @@
+FROM alpine
+
+RUN apk add --no-cache uwsgi-python3 python3
+
+# partly from https://hub.docker.com/_/python?tab=description#create-a-dockerfile-in-your-python-app-project
+WORKDIR /usr/src/wmn
+COPY requirements.txt ./
+RUN pip3 install --no-cache-dir -r requirements.txt
+
+# copy required source files
+COPY wmn.py ./
+
+WORKDIR /run/wmn
+# requires config.yml to be present at build
+COPY config.yml ./
+RUN chown -R 999 /run/wmn && chmod 0600 /run/wmn/config.yml
+
+USER 999
+
+# opens a uwsgi socket at port 3031, which is to be used by a reverse proxy
+CMD [ "uwsgi", "--die-on-term", \
+               "--need-plugin", "python3", \
+               "--socket", "0.0.0.0:3031", \
+               "--wsgi-file", "/usr/src/wmn/wmn.py", \
+               "--master", \
+               "--processes", "1", \
+               "--threads", "2" ]