drm/ci: export kernel config

Export the resultant kernel config, making it easier to verify if the
resultant config was correctly generated.

Suggested-by: Rob Clark <[e-mail]>
Signed-off-by: Helen Koike <[e-mail]>
Acked-by: Dmitry Baryshkov <[e-mail]>
Reviewed-by: David Heidelberg <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/ci/build.sh

···
 mv install/* artifacts/install/.
 rm -rf artifacts/install/modules
 ln -s common artifacts/install/ci-common
+cp .config artifacts/${CI_JOB_NAME}_config
 
 for image in ${KERNEL_IMAGE_NAME}; do
     cp /lava-files/$image artifacts/install/.

drivers/gpu/drm/ci/image-tags.yml

···
    DEBIAN_BASE_TAG: "${CONTAINER_TAG}"
 
    DEBIAN_X86_64_BUILD_IMAGE_PATH: "debian/x86_64_build"
-   DEBIAN_BUILD_TAG: "2023-10-08-igt"
+   DEBIAN_BUILD_TAG: "2023-10-08-config"
 
    KERNEL_ROOTFS_TAG: "2023-10-06-amd"