.github: run CI on tag push

Signed-off-by: Simon Ott <simon.ott@aisec.fraunhofer.de>

Author: smo4201

.github/workflows/build.yml

@@ -4,6 +4,8 @@ on:
   push:
     branches:
       - main
+    tags:
+        - "v*.*.*"
   pull_request:
     types: [opened, synchronize, reopened]