Non-reproducible container build failure with meson and gtk-doc
After https://gitlab.xfce.org/xfce/xfce4-dev-tools/-/merge_requests/147, I had [a crash](https://gitlab.xfce.org/xfce/xfce4-dev-tools/-/jobs/73059) that the logs don't say much about except that there is an attempt to copy files that have not yet been generated: ``` #10 157.5 cp: cannot stat 'build/docs/reference/libxfce4windowing/html/.': No such file or directory #10 ERROR: process "/bin/sh -c /git/build_libs.sh" did not complete successfully: exit code: 1 ``` Relaunching the build [fixes the problem](https://gitlab.xfce.org/xfce/xfce4-dev-tools/-/jobs/73063): ``` #10 182.6 Running custom install script '/usr/bin/meson --internal gtkdoc --sourcedir=/git/libxfce4windowing --builddir=/git/libxfce4windowing/build ``` I don't think it's related to libxfce4windowing, in my opinion it could just as easily happen with any other project containing docs. And I don't think we're doing anything wrong here either, so I wouldn't be surprised if the problem was with meson or the GNOME module (for which we've already reported an unnecessary doc rebuild bug in the past). So I wonder if we shouldn't just remove the doc from the container build, since it serves no purpose I think, and just leave it in CI.
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