Small fix with the environment

backend/main.go

@@ -42,14 +42,16 @@ func main() {
 
 	port := os.Getenv("BACKEND_DOCKER_PORT")
 	hostname := os.Getenv("DATABASE_HOSTNAME")
+	postgres_port := os.Getenv("POSTGRES_DOCKER_PORT")
 	if environ == "DEV" {
 		port = os.Getenv("BACKEND_PORT")
 		hostname = "localhost"
+		postgres_port = os.Getenv("POSTGRES_PORT")
 	}
 
 	dsn := core.DSN{
 		Hostname: hostname,
-		Port:     os.Getenv("POSTGRES_PORT"),
+		Port:     postgres_port,
 		DBName:   os.Getenv("POSTGRES_DB"),
 		User:     os.Getenv("POSTGRES_USER"),
 		Password: os.Getenv("POSTGRES_PASSWORD"),