Docker mix install helper

mix_dep_install.sh

#!/bin/sh

# manually download and "install" a given mix dep for non-elixir environment
#
# for example, download phoenix in a frontend build stage to get JS deps

depname=$1
version=$(grep "\"$depname\"" mix.lock | cut -d, -f 3 | sed -e 's/ *"//g')

echo "installing $depname version $version..."

mkdir -p deps
cd deps

wget https://s3.amazonaws.com/s3.hex.pm/tarballs/$depname-$version.tar
mkdir $depname
tar xf $depname-*.tar -C $depname
cd $depname
tar zxf contents.tar.gz

echo "done!"