Split docker image into two

Simplifies the rebuild process when the environment doesn't change

Dockerfile

-FROM debian:jessie
-WORKDIR /root
-ENV LANG=C.UTF-8
-
-# Initial system setup
-RUN apt-get update && apt-get install -y \
-	ca-certificates \
-	wget \
-	time \
-	git \
-	build-essential \
-	sbcl \
-	libz-dev \
-	--no-install-recommends \
-	&& apt-get clean \
-	&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
-# Install all needed dependencies
-ADD https://raw.githubusercontent.com/quicklisp/quicklisp-controller/master/debian-setup/debian-8-packages.txt .
-ADD https://www.quicklisp.org/quicklisp-controller/packages.tar .
-RUN apt-get update && apt-get install -y \
-	--no-install-recommends `cat debian-8-packages.txt` \
-	&& tar xvf packages.tar \
-	&& dpkg -i packages/*.deb \
-	&& apt-get clean \
-	&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
-	&& rm -rf packages packages.tar debian-8-packages.txt
-
-# Build sbcl
-RUN git clone https://github.com/sbcl/sbcl \
-	&& cd sbcl \
-	&& git checkout sbcl-1.3.21 \
-	&& sh make.sh --fancy --dynamic-space-size=2560 \
-	&& sh install.sh \
-	&& cd .. \
-	&& rm -rf sbcl
-
-# Build makeinfo
-RUN wget http://ftp.gnu.org/gnu/texinfo/texinfo-6.5.tar.xz \
-	&& tar xvf texinfo-6.5.tar.xz \
-	&& cd texinfo-6.5 \
-	&& ./configure \
-	&& make \
-	&& make install \
-	&& cd .. \
-	&& rm -rf texinfo*
+FROM alarsyo/quickref-buildenv
 
 # Setup quickref user
 RUN useradd -m -s /bin/bash quickbuilder \

Dockerfile-buildenv

+FROM debian:jessie
+WORKDIR /root
+ENV LANG=C.UTF-8
+
+# Initial system setup
+RUN apt-get update && apt-get install -y \
+	ca-certificates \
+	wget \
+	time \
+	git \
+	build-essential \
+	sbcl \
+	libz-dev \
+	--no-install-recommends \
+	&& apt-get clean \
+	&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Install all needed dependencies
+ADD https://raw.githubusercontent.com/quicklisp/quicklisp-controller/master/debian-setup/debian-8-packages.txt .
+ADD https://www.quicklisp.org/quicklisp-controller/packages.tar .
+RUN apt-get update && apt-get install -y \
+	--no-install-recommends `cat debian-8-packages.txt` \
+	&& tar xvf packages.tar \
+	&& dpkg -i packages/*.deb \
+	&& apt-get clean \
+	&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
+	&& rm -rf packages packages.tar debian-8-packages.txt
+
+# Build sbcl
+RUN git clone https://github.com/sbcl/sbcl \
+	&& cd sbcl \
+	&& git checkout sbcl-1.3.21 \
+	&& sh make.sh --fancy --dynamic-space-size=2560 \
+	&& sh install.sh \
+	&& cd .. \
+	&& rm -rf sbcl
+
+# Build makeinfo
+RUN wget http://ftp.gnu.org/gnu/texinfo/texinfo-6.5.tar.xz \
+	&& tar xvf texinfo-6.5.tar.xz \
+	&& cd texinfo-6.5 \
+	&& ./configure \
+	&& make \
+	&& make install \
+	&& cd .. \
+	&& rm -rf texinfo*