Add support for docker containers, mqtt prefix, environment variables for config, and pip requirements

Dockerfile

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+FROM python:3.8-rc-alpine
+
+WORKDIR /opt/miscale
+COPY src /opt/miscale
+
+RUN apk update && \
+    apk add --no-cache \
+        dcron \
+        bash \
+        bash-doc \
+        bash-completion \
+        tar \
+        linux-headers \
+        gcc \
+        make \
+        glib-dev \
+        alpine-sdk \
+    && rm -rf /var/cache/apk/*
+
+RUN pip install -r requirements.txt
+
+RUN mkdir -p /var/log/cron \
+    && mkdir -m 0644 -p /var/spool/cron/crontabs \
+    && touch /var/log/cron/cron.log \
+    && mkdir -m 0644 -p /etc/cron.d && \
+    echo -e "*/5 * * * * python3 /opt/miscale/Xiaomi_Scale.py\n" >> /var/spool/cron/crontabs/root
+
+## Cleanup
+RUN apk del alpine-sdk gcc make tar
+
+# Copy in docker scripts to root of container... (cron won't run unless it's run under bash/ash shell)
+COPY dockerscripts/ /
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["/cmd.sh"]
+
+# To test, run with the following:
+# docker run --rm -it --privileged --net=host -e MISCALE_MAC=0C:95:41:C9:46:43 -e MQTT_HOST=10.16.10.4  mi-scale_mi-scale