disable pip cache in docker build

Author: jw3

Dockerfile

@@ -3,6 +3,6 @@ FROM ctcoss/get-lfs
 WORKDIR /opt/src
 COPY . /opt/src
 
-RUN python -m pip install -r requirements.txt
+RUN python -m pip install -r requirements.txt --no-cache-dir
 
 ENTRYPOINT ["python", "-m", "xview_lfs.yolo"]