Add a condition for github action to run

Currently, this github action has been tested only
on 9.2 CIQ LTS kernel so just add that branch as a
condition to run the test.

Signed-off-by: Shreeya Patel <spatel@ciq.com>

Author: shreeya-patel98

.github/workflows/kernel-build-and-test-x86_64.yml

@@ -1,5 +1,8 @@
 name: Automated kernel build and test (x86_64)
-on: [push]
+on:
+  push:
+    branches:
+      - 'ciqlts9_2'
 
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   contents: read