Changes trigger type from 'pr' into 'branch'

Previously trigger type was pull_request and events were
opened, reopened and synchronize.
In PR #6623, packaging pipeline was not triggered and PR was blocked
. It may be a bug in GH Actions side.
To make sure of execution of the pipeline, I changed pipeline
execution type into 'branches'

.github/workflows/packaging-test-pipelines.yml

@@ -1,8 +1,8 @@
 name: Build tests in packaging images
 
 on:
-  pull_request:
-    types: [opened, reopened,synchronize]
+  push:
+    branches: "**"
 
   workflow_dispatch: