volume property
Volume is the persistent volume attached to the sandbox, when it has one. A dev sandbox keeps its work across leases through it; an exec sandbox has none and loses everything outside /mnt/data when the lease ends.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? volume;