build: Also pass target arch to setup-env-build

We will use this to find out whether or not to install cross-compilation toolchain.
Similar to #261

Signed-off-by: Manu Bretelle <chantr4@gmail.com>

Author: chantra

.github/workflows/kernel-build.yml

@@ -91,6 +91,7 @@ jobs:
       - name: Setup build environment
         uses: libbpf/ci/setup-build-env@main
         with:
+          arch: ${{ inputs.arch }}
           llvm-version: ${{ inputs.llvm-version }}
       - name: Build kernel image
         uses: libbpf/ci/build-linux@main