Build Manila images on tag

Change-Id: I9a069aae54dec49b6885d08b662e4baf1ee0f703
diff --git a/.github/workflows/manila.yml b/.github/workflows/manila.yml
index aae04df..f43339d 100644
--- a/.github/workflows/manila.yml
+++ b/.github/workflows/manila.yml
@@ -23,9 +23,8 @@
       - main
     paths:
       - .github/workflows/manila.yml
-  release:
-    types:
-      - published
+    tags:
+      - v*
   workflow_dispatch:
 
 jobs: