Add the EROFS rootfs support #9648
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Add the EROFS rootfs support
This PR adds the EROFS rootfs support. No gofer process will be created for the container, when there is no need to pass through host files into a container via the gofer process. Annotations for rootfs are introduced to provide extra information, including the mount source, mount type and overlay config.
busybox-staticis also added to the default image and will be used to build the EROFS rootfs images during the test. The overlay medium is refactored fromstringto a new typeOverlayMedium. Now all overlay medium related methods, such as validation and extracting anon directory, are implemented on this type. TheGoferMountConfis decoupled to two layers to allow us to configure all combinations of a gofer mount in a succinct way.cc @ayushr2
FUTURE_COPYBARA_INTEGRATE_REVIEW=#9486 from btw616:erofs-CR-and-rootfs-support bff1150