chore(runner): update runner status using proto define

Signed-off-by: Bo-Yi.Wu <appleboy.tw@gmail.com>

core/status.go

@@ -2,7 +2,6 @@ package core
 
 // BuildStatus represents a build status
 type BuildStatus string
-type RunnerStatus string
 
 // enumerate all the statuses of bot build
 const (
@@ -17,11 +16,6 @@ const (
 	StatusFailing  BuildStatus = "failure"
 	StatusKilled   BuildStatus = "killed"
 	StatusError    BuildStatus = "error"
-
-	// Runner status
-	StatusIdle    RunnerStatus = "idle"
-	StatusActive  RunnerStatus = "active"
-	StatusOffline RunnerStatus = "offline"
 )
 
 func (status BuildStatus) IsPending() bool {