Freeze 0.12.0 version

Change-Id: Id4a4cad70595cf915b8d5d8808bb03174d45fc5e
Signed-off-by: Juha Hyttinen <juha.hyttinen@nokia.com>
diff --git a/container-tag.yaml b/container-tag.yaml
index 7eafb9e..a67cace 100644
--- a/container-tag.yaml
+++ b/container-tag.yaml
@@ -2,4 +2,4 @@
 # By default this file is in the docker build directory,
 # but the location can configured in the JJB template.
 ---
-tag: 0.12.0
+tag: 0.13.0