github actions: Add ciq-6.12.y and ciq-6.18.y to Kernel CI whitelist

Author: bmastbergen

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

@@ -335,7 +335,7 @@ jobs:
 
         # Define whitelist of valid base branches
         # TODO: Use a centralized place to get the base branches
-        VALID_BASES="ciqlts9_2 ciqlts9_4 ciqlts8_6 ciqlts9_6"
+        VALID_BASES="ciqlts9_2 ciqlts9_4 ciqlts8_6 ciqlts9_6 ciq-6.12.y ciq-6.18.y"
 
         echo "Current branch: $BRANCH_NAME"