feat: #1

errors.go

event-bus.go

import.go

import_test.go

issue-1_test.go

job.go

manager.go

manager_test.go

runnable-counter.go

runnable-fileoperation.go

runnable-gorm.go

runnable-http.go

runnable-mail.go

runnable-sftp.go

runnable-shell.go

scheduler.go

state.go

worker_test.go