ci: Shrink container/rootfs sizes.

Cutting the extra VK mustpass files is 315MB out of 1.5GB of the amd64
rootfs.  pip was 10MB.  The rustup toolchains were massive (over a GB
IIRC) on the x86 container images.

Hopefully helps with #5837

Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14460>

.gitlab-ci.yml

@@ -432,13 +432,13 @@ debian/x86_test-gl:
   variables:
     FDO_DISTRIBUTION_EXEC: 'env KERNEL_URL=${KERNEL_URL} FDO_CI_CONCURRENT=${FDO_CI_CONCURRENT} bash .gitlab-ci/container/${CI_JOB_NAME}.sh'
     KERNEL_URL: &kernel-rootfs-url "https://gitlab.freedesktop.org/gfx-ci/linux/-/archive/v5.15-for-mesa-ci-540a4af22d71/linux-v5.15-for-mesa-ci-540a4af22d71.tar.bz2"
-    MESA_IMAGE_TAG: &debian-x86_test-gl "2021-11-25-ci-fairy"
+    MESA_IMAGE_TAG: &debian-x86_test-gl "2022-01-07-shrink"
 
 # Debian 11 based x86 test image for VK
 debian/x86_test-vk:
   extends: .use-debian/x86_test-base
   variables:
-    MESA_IMAGE_TAG: &debian-x86_test-vk "2021-12-02-piglit"
+    MESA_IMAGE_TAG: &debian-x86_test-vk "2022-01-07-shrink"
 
 # Debian 11 based ARM build image
 debian/arm_build:
@@ -487,7 +487,7 @@ fedora/x86_build:
   variables:
     GIT_STRATEGY: fetch
     KERNEL_URL: *kernel-rootfs-url
-    MESA_ROOTFS_TAG: &kernel-rootfs "2021-12-22-skqp"
+    MESA_ROOTFS_TAG: &kernel-rootfs "2022-01-07-shrink"
     DISTRIBUTION_TAG: &distribution-tag-arm "${MESA_ROOTFS_TAG}--${MESA_ARTIFACTS_TAG}--${MESA_TEMPLATES_COMMIT}"
   script:
     - .gitlab-ci/container/lava_build.sh