release.py: sign tags when cutting releases.

diff --git a/release.py b/release.py
index c9b35496c2ebe4e01eace7e940de53ddcd05b5f0..1a87d3cd4b18d9b8a6e652dc1a706ee2fdf63efe 100755 (executable)
--- a/release.py
+++ b/release.py
@@ -81,7 +81,7 @@ def commit(commit_message):
 
 def tag(tag):
     print 'tag current revision', tag
-    invoke(['git', 'tag', tag])
+    invoke(['git', 'tag', '-s', '-m', 'version {}'.format(tag), tag])
 
 def export(target_dir):
     if not target_dir.endswith(os.path.sep):