build: print $toolchain --version

Signed-off-by: Manu Bretelle <[email protected]>

.github/workflows/kernel-build.yml

@@ -93,6 +93,10 @@ jobs:
         with:
           arch: ${{ inputs.arch }}
           llvm-version: ${{ inputs.llvm-version }}
+      - name: Print toolchain version used
+        shell: bash
+        run: |
+          ${{ inputs.toolchain_full }} --version
       - name: Build kernel image
         uses: libbpf/ci/build-linux@main
         with: