add backport barrier

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

debian-bpo11-barrier/version.sh

+#!/bin/bash -e
+
+#https://packages.debian.org/source/bullseye-backports/barrier
+mirror="https://deb.debian.org/debian"
+
+package_name="barrier"
+debian_pkg_name="${package_name}"
+package_version="2.4.0+dfsg"
+
+git_repo=""
+git_sha=""
+reprepro_dir="b/${package_name}"
+dl_path="pool/main/${reprepro_dir}/"
+
+debian_version="${package_version}-2~bpo11+1"
+debian_untar="${package_name}_${debian_version}.debian.tar.xz"
+debian_patch=""
+
+dist="debian"
+suite="bullseye"
+deb_arch="arm64"