github actions: validate-kernel-commits: Clone kernel-src-tree-tools

We are using two scripts from that repo and there will be more.  Just
clone the whole thing instead of fetching scripts one by one.

Author: bmastbergen

.github/workflows/validate-kernel-commits.yml

@@ -23,12 +23,12 @@ jobs:
         run: |
           git fetch origin ${{ github.base_ref }}:${{ github.base_ref }}
 
-      - name: Download check_kernel_commits.py
-        run: |
-          curl -sL \
-            https://raw.githubusercontent.com/ctrliq/kernel-src-tree-tools/mainline/check_kernel_commits.py \
-            -o check_kernel_commits.py
-          chmod +x check_kernel_commits.py
+      - name: Checkout kernel-src-tree-tools
+        uses: actions/checkout@v4
+        with:
+          repository: ctrliq/kernel-src-tree-tools
+          ref: 'mainline'
+          path: kernel-src-tree-tools
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -37,8 +37,9 @@ jobs:
 
       - name: Run upstream fixes check
         id: check-kernel-commits
+        working-directory: kernel-src-tree-tools
         run: |
-          python3 check_kernel_commits.py --repo . --pr_branch "${{ github.head_ref }}" --base_branch "${{ github.base_ref }}" --markdown --check-cves | tee result.txt
+          python3 check_kernel_commits.py --repo .. --pr_branch "${{ github.head_ref }}" --base_branch "${{ github.base_ref }}" --markdown --check-cves | tee ../result.txt
           # Save non-empty results for PR comment
           if grep -q -v "All referenced commits exist upstream and have no Fixes: tags." result.txt; then
             echo "has_findings=true" >> $GITHUB_OUTPUT
@@ -66,17 +67,11 @@ jobs:
           ./configure
           make -j$(nproc)
 
-      - name: Download run_interdiff.py
-        run: |
-          curl -sL \
-            https://raw.githubusercontent.com/ctrliq/kernel-src-tree-tools/mainline/run_interdiff.py \
-            -o run_interdiff.py
-          chmod +x run_interdiff.py
-
       - name: Run interdiff check
         id: interdiff
+        working-directory: kernel-src-tree-tools
         run: |
-          python3 run_interdiff.py --repo . --pr_branch "${{ github.head_ref }}" --base_branch "${{ github.base_ref }}" --markdown --interdiff ./patchutils/src/interdiff | tee interdiff_result.txt
+          python3 run_interdiff.py --repo .. --pr_branch "${{ github.head_ref }}" --base_branch "${{ github.base_ref }}" --markdown --interdiff ../patchutils/src/interdiff | tee ../interdiff_result.txt
           # Save non-empty results for PR comment
           if grep -q -v "All backported commits match their upstream counterparts." interdiff_result.txt; then
             echo "has_differences=true" >> $GITHUB_OUTPUT