docs: Add axum-postgres-template to ECOSYSTEM.md (#2771)

ECOSYSTEM.md

@@ -61,6 +61,7 @@ If your project isn't listed here and you would like it to be, please feel free
 - [realworld-axum-sqlx](https://github.com/launchbadge/realworld-axum-sqlx): A Rust implementation of the [Realworld] demo app spec using Axum and [SQLx].
   See https://github.com/davidpdrsn/realworld-axum-sqlx for a fork with up to date dependencies.
 - [Rustapi](https://github.com/ndelvalle/rustapi): RESTful API template using MongoDB
+- [axum-postgres-template](https://github.com/koskeller/axum-postgres-template): Production-ready Axum + PostgreSQL application template
 - [RUSTfulapi](https://github.com/robatipoor/rustfulapi): Reusable template for building REST Web Services in Rust. Uses Axum HTTP web framework and SeaORM.
 - [Jotsy](https://github.com/ohsayan/jotsy): Self-hosted notes app powered by Skytable, Axum and Tokio
 - [Svix](https://www.svix.com) ([repository](https://github.com/svix/svix-webhooks)): Enterprise-ready webhook service