Add /proc/gvisor/kernel_is_gvisor marker file used to detect gVisor.
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This change adds a configuration option to gVisor that, when enabled, creates a file at `/proc/gvisor/kernel_is_gvisor` that can be used by applications to detect whether they are running inside a gVisor sandbox. Useful for testing and introspection. PiperOrigin-RevId: 749217117
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Add
/proc/gvisor/kernel_is_gvisormarker file used to detect gVisor.This change adds a configuration option to gVisor that, when enabled,
creates a file at
/proc/gvisor/kernel_is_gvisorthat can be used byapplications to detect whether they are running inside a gVisor sandbox.
Useful for testing and introspection.