add Dockerfile

Dockerfile

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+FROM alpine
+
+MAINTAINER Niklas Elsbrock
+
+# add apk edge repositories (including `testing` for py3-flask-sqlalchemy)
+# and update package index
+RUN echo -e "https://dl-cdn.alpinelinux.org/alpine/edge/main/\n"\
+"https://dl-cdn.alpinelinux.org/alpine/edge/community/\n"\
+"https://dl-cdn.alpinelinux.org/alpine/edge/testing/"\
+	> /etc/apk/repositories \
+	&& apk --no-cache update
+
+# install nateman
+RUN apk --no-cache add \
+	python3 \
+	py3-flask \
+	py3-flask-sqlalchemy \
+	py3-click \
+	py3-yaml \
+	py3-bcrypt \
+	py3-openpyxl \
+	&& mkdir -p /srv/nateman/nateman
+
+COPY nateman /srv/nateman/nateman
+WORKDIR /srv/nateman
+
+# expose webserver port
+EXPOSE 8080
+
+# start command
+CMD ["env","FLASK_APP=nateman","FLASK_ENV=development",\
+	"flask","run","--host=0.0.0.0","--port=8080"]