fixup add doc for regexp

Author: lool

.github/workflows/linux.yml

@@ -99,8 +99,10 @@ jobs:
     uses: ./.github/workflows/debos.yml
     with:
       mainline_kernel: true
-      # 
-      kernelpackage: ~n^linux-image-[0-9a-z.-]*-upstream$
+      # sample names we want to match:
+      # - linux-image-6.17.0-upstream
+      # - linux-image-6.17.0-rc4-upstream
+      kernelpackage: ~n^linux-image-[0-9a-z.-]*-upstream-$
 
   test-mainline-linux:
     uses: ./.github/workflows/test.yml