shrink docker image based on nico's update

docker/chunkflow/Dockerfile

@@ -1,47 +1,44 @@
 FROM seunglab/chunkflow:latest 
 MAINTAINER Jingpeng Wu
-# This image contains private keys, make sure the image is not pushed to docker hub or any public repo.
+
 ## INSTALL gsutil
 # Prepare the image.
 ENV DEBIAN_FRONTEND noninteractive
-RUN apt-get update && apt-get install -y -qq --no-install-recommends \
- apt-utils \
-# software-properties-common \
- curl \
- git \
- openssh-client \
-# python-h5py \
- libboost-all-dev \
-# libhdf5-dev \
-# liblzma-dev \
-# libgmp-dev \
-# libmpfr-dev \
-# libxml2-dev \
-# unzip \
-# vim \
- git \
- wget \
- zlib1g-dev \
- && apt-get clean \
- && rm -rf /var/lib/apt/lists/*
-
-# we can only use numpy==1.15 due to an issue of skimage:
-# https://github.com/scikit-image/scikit-image/issues/3551
-# the fix was not released yet. 
-# https://github.com/scikit-image/scikit-image/pull/3556
-RUN pip install pip setuptools pyasn1 -U --no-cache-dir \
- && pip install Cython wheel numpy==1.15 --no-cache-dir 
 
 # install igneous 
 WORKDIR /
+RUN git clone --depth 1 --single-branch -b chunkflow https://github.com/seung-lab/igneous.git 
 
-RUN mkdir /.ssh \
- && git clone --depth 1 --single-branch -b chunkflow https://github.com/seung-lab/igneous.git \
- && pip install -r /igneous/requirements.txt --no-cache-dir 
-
-WORKDIR /igneous 
-RUN pip install intern -U --no-cache-dir \
- && pip install -e . --no-cache-dir
+RUN apt-get update \
+ # Build dependencies
+ && apt-get install -y -qq --no-install-recommends \
+ git \
+ libboost-dev \
+ build-essential \
+ # igneous + runtime dependencies
+ && cd igneous \
+ && pip install --no-cache-dir -r requirements.txt \
+ # we can only use numpy==1.15 due to an issue of skimage:
+ # https://github.com/scikit-image/scikit-image/issues/3551
+ # the fix was not released yet. 
+ # https://github.com/scikit-image/scikit-image/pull/3556
+ && pip install numpy==1.15 --no-cache-dir \
+ && pip install --no-cache-dir -e . \
+ \
+ # Cleanup build dependencies
+ && apt-get remove --purge -y \
+ libboost-dev \
+ build-essential \
+ && apt-get autoremove --purge -y \
+ # Cleanup apt
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/* \
+ # Cleanup temporary python files
+ && find /usr/local/lib/python3.6 -depth \
+ \( \
+ \( -type d -a \( -name __pycache__ \) \) \
+ -o \
+ \( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
+ \) -exec rm -rf '{}' +
 
-RUN apt-get remove -y libboost-dev
 #CMD python /igneous/igneous/task_execution.py