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Add `ethtool` as a dependency to the rootfs image. Tested by running and building the rootfs images with both `sudo ./mkrootfs_arch.sh` and `sudo ./mkrootfs_debian.sh` and running in qemu with: ``` wget https://libbpf-ci.s3-us-west-1.amazonaws.com/x86_64/vmlinuz-5.5.0 rootfs_img=rootfs.img kernel_bzimage=vmlinuz-5.5.0 mkdir rootfs touch rootfs.img truncate -s 2G rootfs.img sudo mount -o loop rootfs.img rootfs cat ~/Downloads/libbpf-vmtest-rootfs-2022.04.25.tar.zst | sudo tar -C rootfs -I zstd -xvf - sudo install -m 755 -o root -g root /dev/stdin rootfs/etc/rcS.d/S50-startup <<'EOF' ethtool -h cat /etc/issue EOF qemu-system-x86_64 -nodefaults -display none -serial mon:stdio -enable-kvm -m 4G -drive file="${rootfs_img}",format=raw,index=1,media=disk,if=virtio,cache=none -kernel "${kernel_bzimage}" -append "root=/dev/vda rw console=ttyS0,115200" ``` The last block printed ethtool's help, confirming the presence of ethtool in the rootfs. `libbpf-vmtest-rootfs-2022.04.25.tar.zst` was generated and uploaded to S3. INDEX in libbpf/ci needs to be changed to make the CI pick it up.