gitlab CI: pass MESON_ARGS down to the wayland-web job

Now that we're firing the wayland website generation as trigger, we're
automatically passing down the variables to the pipeline. Let's pass down
something sensible, we already had one issue with our space-separated
'build dir' and let's not require more than absolutely necessary to build
the docs.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

.gitlab-ci.yml

@@ -907,6 +907,9 @@ wayland-web:
   except:
     refs:
       - schedules
+  variables:
+    MESON_ARGS: '-Ddebug-gui=false -Dlibwacom=false -Dtests=false'
+    MESON_BUILDDIR: 'builddir'
   only:
     refs:
       - master

.gitlab-ci/ci.template

@@ -714,6 +714,9 @@ wayland-web:
   except:
     refs:
       - schedules
+  variables:
+    MESON_ARGS: '-Ddebug-gui=false -Dlibwacom=false -Dtests=false'
+    MESON_BUILDDIR: 'builddir'
   only:
     refs:
       - master