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These are a set of core changes required to support read-only operation with some downstream images. It also lays the groundwork for potential support of --user with s6 3.2. Also requires some changes to the base images (see linuxserver/docker-baseimage-alpine#246 for example), both can be merged independently without breaking anything.
If testing, /run needs to be mounted to tmpfs with exec, and to stop warnings in the logs currently /var/spool/cron/crontabs also needs to be mounted to tmpfs.