Test bpf tree

Author: theihor

.github/workflows/kernel-build.yml

@@ -79,7 +79,8 @@ jobs:
         uses: libbpf/ci/get-linux-source@v3
         with:
           dest: '.kernel'
-          rev: ${{ env.BPF_NEXT_BASE_BRANCH }}
+          repo: 'git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git'
+          rev: 'master'
       - uses: libbpf/ci/prepare-incremental-build@v3
         with:
           repo-root: ${{ inputs.download_sources && '.kernel' || env.REPO_ROOT }}