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

Change-Id: Iddf675d220dcb6deb8e99bc1ccccd6238fee46e1
diff --git a/VERSION b/VERSION
index 9a4a230..c043eea 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.1.dev3
+2.2.1