feat: add backend_v1 migration

backend_v1/app/jobs/demo_cron.go

@@ -0,0 +1,36 @@
+package jobs
+
+import (
+	"time"
+
+	. "github.com/riverqueue/river"
+	"github.com/sirupsen/logrus"
+	_ "go.ipao.vip/atom"
+	"go.ipao.vip/atom/contracts"
+)
+
+var _ contracts.CronJob = (*DemoCronJob)(nil)
+
+// @provider(cronjob)
+type DemoCronJob struct {
+	log *logrus.Entry `inject:"false"`
+}
+
+// Prepare implements contracts.CronJob.
+func (DemoCronJob) Prepare() error {
+	return nil
+}
+
+// JobArgs implements contracts.CronJob.
+func (DemoCronJob) Args() []contracts.CronJobArg {
+	return []contracts.CronJobArg{
+		{
+			Arg: DemoJob{
+				Strings: []string{"a", "b", "c", "d"},
+			},
+
+			PeriodicInterval: PeriodicInterval(time.Second * 10),
+			RunOnStart:       false,
+		},
+	}
+}