Run CI on push to *.*.x branch

Run on merge in other words

Author: simPod

.github/workflows/continuous-integration.yml

@@ -6,7 +6,7 @@ on:
   pull_request:
   push:
     branches:
-      - "master"
+      - "*.*.x"
   schedule:
     - cron: "0 17 * * *"