add docker stuff for building

docker/build.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -euo pipefail
+
+base=$(pwd)
+
+git clone -b devel --depth 1000 git://github.com/nim-lang/nim nim
+cd nim
+# before unchecked was removed:
+git checkout cc5b8c6
+sh build_all.sh
+export PATH=$(base)/nim/bin:$PATH
+
+cd $base
+git clone --depth 1 git://github.com/brentp/duphold.git
+cd duphold
+nimble install -y kexpr
+nimble install -y genoiser
+
+nimble install -y
+
+nim c -d:release src/duphold.nim 
+cp ./src/duphold /io

docker/hbb.sh

@@ -0,0 +1,7 @@
+set -e
+mkdir -p built/
+cp docker/build.sh built/
+docker run -t -i --rm -v `pwd`/built:/io \
+    centos:centos6 \
+    bash -c "yum install -y git curl wget && wget http://people.centos.org/tru/devtools-2/devtools-2.repo -O /etc/yum.repos.d/devtools-2.repo && yum install -y devtoolset-2-gcc devtoolset-2-binutils devtoolset-2-gcc-c++ && chmod +x /io/build.sh && scl enable devtoolset-2 /io/build.sh"
+echo "binary in built/"