Let's find the right os-release file on the host side, and only mount the one that matters, i.e. /etc/os-release if it exists and /usr/lib/os-release otherwise. Use the fixed path /run/host/os-release for that. Let's also mount /run/host as a bind mount on itself before we set up /run/host, and let's mount it MS_RDONLY after we are done, so that it remains immutable as a whole.
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