Updated CI configuration

Author: zonia3000

.github/workflows/end_to_end_tests.yaml

@@ -1,6 +1,10 @@
 name: End-to-end tests
 
-on: [workflow_call]
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
 
 jobs:
   end_to_end_tests:

.github/workflows/unit_tests.yaml

@@ -1,6 +1,10 @@
 name: Unit tests
 
-on: [workflow_call]
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
 
 jobs:
   unit_tests: