Fix condition

Author: farshidz

.github/workflows/integration_tests_CI.yml

@@ -3,11 +3,10 @@ run-name: Integration tests with ${{ inputs.number_of_shards || 1 }} shards and
 # runs integration tests on AMD64 machine
 
 on:
-  on:
-    pull_request:
-      branches:
-        - mainline
-        - releases/*
+  pull_request:
+    branches:
+      - mainline
+      - releases/*
   workflow_call:
     inputs:
       number_of_shards: