Use setup-build-env with modified pahole

Author: theihor

.github/workflows/kernel-build.yml

@@ -91,7 +91,7 @@ jobs:
           patches-root: '${{ github.workspace }}/ci/diffs'
           repo-root: ${{ env.REPO_ROOT }}
       - name: Setup build environment
-        uses: libbpf/ci/setup-build-env@v2
+        uses: theihor/libbpf-ci/setup-build-env@hacked.pahole
         with:
           arch: ${{ inputs.arch }}
           llvm-version: ${{ inputs.llvm-version }}