Added minimal Dockerfile for builds with Docker Hub

Dockerfile

@@ -0,0 +1,37 @@
+# This is a minimized version from docker/docker-py3-kms/Dockerfile without sqllite support to reduce image size
+
+FROM alpine:3.8
+
+ENV IP		0.0.0.0
+ENV PORT		1688
+ENV EPID		""
+ENV LCID		1033
+ENV CLIENT_COUNT	26
+ENV ACTIVATION_INTERVAL	120
+ENV RENEWAL_INTERVAL	10080
+ENV HWID		"364F463A8863D35F"
+ENV LOGLEVEL	ERROR
+ENV LOGFILE		/var/log/pykms_logserver.log
+ENV LOGSIZE		""
+
+RUN apk add --no-cache --update \
+	bash \
+	git \
+	py3-argparse \
+	py3-flask \
+	py3-pygments \
+	python3-tkinter \
+	sqlite-libs \
+	py3-pip && \
+    pip3 install peewee tzlocal && \
+    apk del git
+
+WORKDIR /home/py-kms
+
+COPY ./py-kms/ /home/py-kms/
+COPY ./docker/docker-py3-kms/start.sh /usr/bin/start.sh
+RUN chmod a+x /usr/bin/start.sh
+
+EXPOSE ${PORT}/tcp
+
+ENTRYPOINT /usr/bin/python3 pykms_Server.py ${IP} ${PORT} -l ${LCID} -c ${CLIENT_COUNT} -a ${ACTIVATION_INTERVAL} -r ${RENEWAL_INTERVAL} -w ${HWID} -V ${LOGLEVEL} -F ${LOGFILE}