Add no-cache-dir option to prevent caching packages, might save space

Docker/Dockerfile

@@ -6,8 +6,8 @@ LABEL version="1.1"
 WORKDIR /app
 COPY . /app
 ENV PYTHONPATH=/app/src/python
-RUN pip3 install --upgrade pip
-RUN pip3 install -r requirements.txt
+RUN pip3 install --no-cache-dir  --upgrade pip
+RUN pip3 install --no-cache-dir -r requirements.txt
 #RUN rm -rf /var/cache/apk
 
 CMD ["/app/src/bin/tHome-eagle.py", "-c", "/app/src/conf"]