cleanup in dockerfile

Dockerfile

@@ -4,20 +4,24 @@ FROM python:3.7-slim
 ## The maintainer name and email
 LABEL maintainer="CHIME/FRB Collaboration"
 
+ADD . /coco
+
 RUN apt-get update && \
     apt-get install -y apt-utils && \
     apt-get install -y software-properties-common && \
     apt-get install -y git && \
     apt-get install -y build-essential && \
     apt-get install -y libmariadb-dev && \
-    apt-get install -y python3-sphinx && \
     apt-get install -y libevent-dev && \
     apt-get install -y libhdf5-dev && \
-    apt-get install -y g++ && \
     pip install flask && \
-    pip install coverage && \
-    pip install pytest-cov && \
-    pip install sphinx_rtd_theme && \
-    git clone --branch aioredis_v2 https://github.com/chime-experiment/coco.git && \
     pip install -r /coco/requirements.txt && \
-    pip install /coco 
+    pip install /coco && \
+
+    #-----------------------
+    # Minimize container size
+    #-----------------------
+    apt-get remove -y curl git && \
+    apt-get autoremove -y && \
+    apt-get clean -y && \
+    rm -rf /tmp/build