ci/lava+baremetal: Add an xserver to the root fs.

We want to be able to test GLX and EGL on real hardware, and we can't do
that with just the surfaceless backend.  Bringing up the xserver is pretty
easy.

Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8727>

.gitlab-ci.yml

@@ -408,7 +408,7 @@ arm64_test:
   extends:
     - .use-arm_test-base
   variables:
-    MESA_IMAGE_TAG: &arm64_test "2021-01-27-kernel"
+    MESA_IMAGE_TAG: &arm64_test "2021-01-29-xserver"
 
 .use-arm64_test:
   variables:
@@ -422,7 +422,7 @@ armhf_test:
   extends:
     - .use-arm_test-base
   variables:
-    MESA_IMAGE_TAG: &armhf_test "2021-01-27-kernel"
+    MESA_IMAGE_TAG: &armhf_test "2021-01-29-xserver"
 
 .use-armhf_test:
   variables:

.gitlab-ci/create-rootfs.sh

@@ -76,6 +76,8 @@ apt-get -y install --no-install-recommends \
     sntp \
     strace \
     wget \
+    xinit \
+    xserver-xorg-core \
     xz-utils
 
 if [ -n "$INCLUDE_PIGLIT" ]; then

.gitlab-ci/lava-gitlab-ci.yml

@@ -1,5 +1,5 @@
 variables:
-  DISTRIBUTION_TAG: "2020-01-13-piglit"
+  DISTRIBUTION_TAG: "2021-01-26-xserver"
 
 .kernel+rootfs:
   stage: container-2