Add Debian Jessie build image

This image is meant to be used to build packages for the Jessie release of Debian. See debian/nginx-build.

debian/jessie/setup.sh

@@ -2,6 +2,7 @@
 
 echo "deb http://security.debian.org/ jessie/updates main" >> /etc/apt/sources.list
 
+apt-get update
 apt-get -y install \
     apt-transport-https \
     lsb-release \