cpio is needed by kernel/gen_kheaders.sh to build
kernel/kheaders_data.tar.bz2. Hence include it as part of Dockerfile.

python3 make_linux.py -a x86_64 -s ~/linux -o ~/linux/out -c clang-17 -k ~/linux/out/.config
[+] Going to build the Linux kernel for x86_64
[+] Using "/home/srikar/linux/out/.config" as kernel config
[+] Using "/home/srikar/linux" as Linux kernel sources directory
[+] Using "/home/srikar/linux/out" as build output directory
[+] Going to build with: clang-17

=== Building with clang-17 ===
Output subdirectory for this build: /home/srikar/linux/out/.config__x86_64__clang-17
Output subdirectory already exists, use it (no cleaning!)
kconfig files "/home/srikar/linux/out/.config" and "/home/srikar/linux/out/.config__x86_64__clang-17/.config" are identical, proceed
Going to save build log to "build_log.txt" in output subdirectory
Compiling with clang requires 'CC=clang'
Run the container: bash ./start_container.sh clang-17 /home/srikar/linux /home/srikar/linux/out/.config__x86_64__clang-17 -n -- make O=../out/ CC=clang 2>&1
    Hey, we gonna use sudo for running docker
    Run docker in NON-interactive mode
    Starting "kernel-build-container:clang-17"
    Mount source code directory "/home/srikar/linux" at "/home/srikar/src"
    Mount build output directory "/home/srikar/linux/out/.config__x86_64__clang-17" at "/home/srikar/out"
    Gonna run command "make O=../out/ CC=clang 2>&1"

    make[1]: Entering directory '/home/srikar/out'
      SYNC    include/config/auto.conf.cmd
      GEN     Makefile
      GEN     Makefile
      UPD     include/generated/compile.h
      CALL    /home/srikar/src/scripts/checksyscalls.sh
      CC      init/version.o
      AR      init/built-in.a
    make[4]: *** [/home/srikar/src/kernel/Makefile:158: kernel/kheaders_data.tar.xz] Error 127
    make[3]: *** [/home/srikar/src/scripts/Makefile.build:480: kernel] Error 2
    make[2]: *** [/home/srikar/src/Makefile:2032: .] Error 2
    make[1]: *** [/home/srikar/src/Makefile:234: __sub-make] Error 2
    make[1]: Leaving directory '/home/srikar/out'
    make: *** [Makefile:234: __sub-make] Error 2
The container returned 2
Finish building the kernel
Only remove the container id file:
    Hey, we gonna use sudo for running docker
    Search "container.id" file in build output directory "/home/srikar/linux/out/.config__x86_64__clang-17"
    OK, "container.id" file exists, removing it
    OK, container 460138d7243910b6ab58ba8da6d28ac10022c4b551b968004af848dfb5f3291f doesn't run
The finish_container.sh script returned 0
See the build log: /home/srikar/linux/out/.config__x86_64__clang-17/build_log.txt

[+] Done, see the results

Signed-off-by: Srikar Dronamraju <[email protected]>

Linux kernel build supports silent build and parallel build.
By default build, its easy to miss the warnings and errors in the
compile log, especially when in interactive mode.

Similarly parallel build will help to get the build the kernel faster.

Signed-off-by: Srikar Dronamraju <[email protected]>