Merge pull request #191 from lool/6.18-rc4

fix(ci/mainline): Bump to 6.18-rc4

Author: lool

.github/workflows/linux.yml

@@ -100,7 +100,7 @@ jobs:
     uses: ./.github/workflows/debos.yml
     with:
       mainline_kernel: true
-      kernelpackage: linux-image-6.18.0-rc3
+      kernelpackage: linux-image-6.18.0-rc4
 
   test-mainline-linux:
     uses: ./.github/workflows/lava-test.yml