SandboxBackgroundCommand

Background command metadata; starting a command returns it immediately while the command keeps running.

Field	Type
`commandId`	`ID!`
`command`	`String!`
`status`	`SandboxBackgroundCommandStatus!`
`signal`	`String`
`heartbeatStatus`	`SandboxCommandHeartbeatStatus!`
`lastHeartbeatAt`	`DateTime`
`lastHeartbeatError`	`String`
`heartbeatFailureCount`	`Int!`
`exitCode`	`Int`
`startedAt`	`String`
`finishedAt`	`String`