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I was struggling with a similar failure, and found this issue that seems related: https://github.com/ros-infrastructure/ros_buildfarm/issues/695.
It looks like this should have been fixed by https://github.com/ros-infrastructure/ros_buildfarm/pull/696, but there hasn't been a new release in a while so maybe those changes haven't landed yet?
It seems like a workaround for now is to create the ~/.ccache directory before running the prerelease script. Or if, as was the case for me, that directory was already created but owned by root, change the ownership to your user (e.g. chown $USER:$USER ~/.ccache). That fixed it for me.
Hope that helps.
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