fix(ci): isolate CI scripts checkout to its own path

Validation build 33673400198 failed: checking out CI scripts to the
workspace root ran actions/checkout's default clean step against the
whole workspace, deleting kernel-src (untracked from this checkout's
ref), which then broke the actual kernel build downstream. The version
suffix step itself failed soft exactly as designed and did not cause
this on its own; the missing kernel-src directory did.

Give this checkout its own path, matching kernel-src and
docker-pkg-build, both of which already isolate themselves the same
way. Update the script invocation path to match.

Signed-off-by: Bjordis Collaku <bcollaku@qti.qualcomm.com>

Author: bjordiscollaku

.github/workflows/build-kernel.yml

@@ -304,13 +304,18 @@ jobs:
           # TEMPORARY, for pre-merge validation of PR #108 only. Will revert
           # to "main" before this PR is marked ready for review.
           ref: feat/qcom-devel-local-version-suffix
+          # A dedicated path, matching kernel-src and docker-pkg-build below.
+          # Checking out to the workspace root instead would run this
+          # checkout's default clean step against the whole workspace,
+          # deleting kernel-src (untracked from this ref's perspective).
+          path: ci-scripts
 
       - name: Apply Qualcomm local version suffix
         env:
           KERNEL_VERSION: ${{ inputs.kernel_version }}
           GH_TOKEN: ${{ github.token }}
         run: |
-          bash ./scripts/apply-local-version-suffix.sh || \
+          bash ./ci-scripts/scripts/apply-local-version-suffix.sh || \
             echo "::warning::Local version suffix step failed; proceeding without it."
 
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