gitlab-ci: fix pages
This hopefully fixes a failure introduced in 5a0706b2:
cp: cannot stat '/builds/wayland/weston/prefix-weston-build-native-meson/share/doc/weston/*': No such file or directory
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This hopefully fixes a failure introduced in 5a0706b2:
cp: cannot stat '/builds/wayland/weston/prefix-weston-build-native-meson/share/doc/weston/*': No such file or directory