Refactor docker file and remove cache to clean up packages after

Docker/Dockerfile

@@ -14,14 +14,20 @@ LABEL org.label-schema.vendor="Evan Richardson"
 LABEL org.label-schema.docker.cmd="docker run --name=py-eagle-mqtt -e MQTT_BROKER_IP=<IP> -e MQTT_BROKER_PORT=1883 -p 22042:22042 -d evanrich/py-eagle-mqtt"
 
 WORKDIR /app
+
 COPY requirements.txt /app
 COPY ./src/conf/logrotate/tHome /etc/logrotate.d/
+
 ENV PYTHONPATH=/app/src/python
-RUN apk --update add --no-cache logrotate \
+
-&& apk upgrade \
+RUN apk --update add --no-cache logrotate && \
-&& pip3 install --no-cache-dir  --upgrade pip \
+    apk upgrade && \
-&& pip3 install --no-cache-dir -r requirements.txt
+    pip3 install --no-cache-dir --upgrade pip && \
+    pip3 install --no-cache-dir -r requirements.txt && \
+    rm -rf /var/cache/apk/*
+
 COPY . /app
+
 CMD ["/app/src/bin/tHome-eagle.py", "-c", "/app/src/conf"]
 
 EXPOSE 22042