worker: add new container resolve job type

This is a new job that can be used to resolve containers. It uses
the existing `container.Resolver` class to do the actual work.

internal/worker/clienterrors/errors.go

@@ -30,6 +30,7 @@ const (
 	ErrorJobMissingHeartbeat  ClientErrorCode = 27
 	ErrorTargetError          ClientErrorCode = 28
 	ErrorParsingJobArgs       ClientErrorCode = 29
+	ErrorContainerResolution  ClientErrorCode = 30
 )
 
 type ClientErrorCode int
@@ -83,6 +84,8 @@ func GetStatusCode(err *Error) StatusCode {
 		return JobStatusUserInputError
 	case ErrorEmptyManifest:
 		return JobStatusUserInputError
+	case ErrorContainerResolution:
+		return JobStatusUserInputError
 	default:
 		return JobStatusInternalError
 	}