[SEBA-497] Release tag an alpine-based image

Change-Id: I8f099e0322e5786a3b3de8c912db9f05f20af1c9
diff --git a/VERSION b/VERSION
index 538ee20..6085e94 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.2.1-dev
+1.2.1