optimize container build

Author: jazzido

Dockerfile

@@ -1,17 +1,18 @@
 FROM jruby:1.7.22-jdk
 MAINTAINER Manuel Aristaran <manuel@jazzido> (@manuelaristaran)
 
-RUN apt-get update && apt-get install -y git software-properties-common mupdf-tools --no-install-recommends
-RUN add-apt-repository -y "deb http://httpredir.debian.org/debian jessie contrib" && apt-get update && apt-get install -y ttf-mscorefonts-installer
+
+RUN echo "deb http://httpredir.debian.org/debian jessie contrib" > /etc/apt/sources.list.d/contrib.list
+RUN apt-get update && apt-get install -y git ttf-mscorefonts-installer mupdf-tools --no-install-recommends
 
 RUN mkdir /tabula-data
 VOLUME /tabula-data
 
-RUN git clone -b master https://github.com/tabulapdf/tabula.git /tabula
+RUN git clone --depth=10 -b master https://github.com/tabulapdf/tabula.git /tabula
 RUN cd /tabula && bundle install
 
 ENV TABULA_DATA_DIR /tabula-data
 
 EXPOSE 9292
 
-CMD cd /tabula && TABULA_DATA_DIR=$TABULA_DATA_DIR rackup -o 0.0.0.0 -p 9292
+CMD cd /tabula && TABULA_DATA_DIR=$TABULA_DATA_DIR JRUBY_OPTS="--server" rackup -o 0.0.0.0 -p 9292