add script to build release tarball

diff --git a/utils/create-release-tarball.sh b/utils/create-release-tarball.sh
new file mode 100755 (executable)
index 0000000..935f086
--- /dev/null
+++ b/utils/create-release-tarball.sh
@@ -0,0 +1,6 @@
+if [ -z $1 ]; then
+       echo usage: $0 VERSION
+       exit 1
+fi
+
+git archive --format=tar --prefix=tt-rss-$1/ $1 | gzip >tt-rss-$1.tar.gz