ci: Add weston to our rootfses for wayland testing.

We want to be able to test the wayland EGL platform code in Mesa, which
has had no coverage yet.

Reviewed-by: David Heidelberg <david.heidelberg@collabora.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19912>

.gitlab-ci/common/generate-env.sh

@@ -62,6 +62,7 @@ for var in \
     HWCI_FREQ_MAX \
     HWCI_KERNEL_MODULES \
     HWCI_KVM \
+    HWCI_START_WESTON \
     HWCI_START_XORG \
     HWCI_TEST_SCRIPT \
     IR3_SHADER_DEBUG \

.gitlab-ci/common/init-stage2.sh

@@ -131,6 +131,15 @@ if [ -n "$HWCI_START_XORG" ]; then
   export DISPLAY=:0
 fi
 
+if [ -n "$HWCI_START_WESTON" ]; then
+  export XDG_RUNTIME_DIR=/run/user
+  mkdir -p $XDG_RUNTIME_DIR
+
+  weston -Bheadless-backend.so -Swayland-0 &
+  export WAYLAND_DISPLAY=wayland-0
+  sleep 1
+fi
+
 RESULT=fail
 set +e
 sh -c "$HWCI_TEST_SCRIPT"