feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

app/models/concerns/model.go

@@ -0,0 +1,14 @@
+// Source: https://gorm.io/gorm/blob/master/model.go
+// Use 64 bit keys
+
+package concerns
+
+// Model base model definition, including fields `ID`, `CreatedAt`, `UpdatedAt`, `DeletedAt`, which could be embedded in your models
+//    type User struct {
+//      gorm.Model
+//    }
+
+// Model provides functionality.
+type Model struct {
+	ID int64 `gorm:"primarykey" json:"id"`
+}