scripts: add "release with rkt"

This script uses rkt and a fedora image to build release tarballs.

scripts/release-with-rkt.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+set -xe
+
+SRC_DIR="${SRC_DIR:-$PWD}"
+
+FEDORA_INSTALL="dnf install -y golang tar xz bzip2 gzip sudo iproute"
+FEDORA_IMAGE="docker://fedora:23"
+
+TAG=$(git describe --exact-match --abbrev=0) || TAG=$(git describe)
+RELEASE_DIR=release-${TAG}
+OUTPUT_DIR=bin
+
+rm -Rf ${SRC_DIR}/${RELEASE_DIR}
+mkdir -p ${SRC_DIR}/${RELEASE_DIR}
+
+sudo -E rkt run \
+  --volume rslvconf,kind=host,source=/etc/resolv.conf \
+  --mount volume=rslvconf,target=/etc/resolv.conf \
+  --volume src-dir,kind=host,source=$SRC_DIR \
+  --mount volume=src-dir,target=/opt/src \
+  --interactive \
+  --insecure-options=image \
+  ${FEDORA_IMAGE} \
+  --exec /bin/bash \
+  -- -xe -c "\
+    ${FEDORA_INSTALL}; cd /opt/src; umask 0022; ./build; ./test || true; \
+    for format in txz tbz2 tgz; do \
+      FILENAME=CNI-${TAG}.\$format; \
+      FILEPATH=${RELEASE_DIR}/\$FILENAME; \
+      tar -C ${OUTPUT_DIR} --owner=0 --group=0 -caf \$FILEPATH .; \
+      pushd ${RELEASE_DIR}; md5sum \$FILENAME > \$FILENAME.md5; popd; \
+    done; \
+    chown -R ${UID} ${OUTPUT_DIR} ${RELEASE_DIR}; \
+    :"