Run unit tests on push to main branch

because otherwise they often get when a developer pushes to main without a PR.

Ensures that unit tests are executed automatically when changes are pushed to the main branch, improving test coverage and early detection of issues in the primary codebase.

(#4563)

Author: sergeibbb

.github/workflows/unit-tests.yml

@@ -1,6 +1,9 @@
 name: Unit tests
 
 on:
+    push:
+        branches:
+            - main
     pull_request:
         branches: ['*']
         types: