🎨 prepare to make the database name configurable

We should not hardcode the database name at different places in
db.Init(). This will allow to make the database path configurable
in a later change, and importantly prevent discrepancies

main.go

@@ -29,9 +29,12 @@ import (
 //	@description				Type "Bearer" followed by a space and JWT token.
 
 func main() {
-	db.Init()
+	gin.SetMode(gin.DebugMode)
+
+	db.Init("hostname-service.db")
 
 	router := gin.Default()
+
 	docs.SwaggerInfo.Host = "localhost:8080"
 	docs.SwaggerInfo.BasePath = "/api/v1"