Implement basic city portal logic (and severely deabstract)

- Create a podman compose for Postgres
- Implement types and tables for urban data
- No longer use a Cargo workspace as there's no point currently
- Create query functionality (not mutation yet)

src/main.rs

@@ -1,3 +1,44 @@
-fn main() {
-    gateway::start();
+use async_graphql_axum::{GraphQLRequest, GraphQLResponse};
+use axum::{
+    Router,
+    routing::{get, post},
+};
+use std::net::SocketAddr;
+
+mod models;
+mod resolvers;
+mod schema;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    let schema = schema::build_schema().await?;
+
+    let app = Router::new()
+        .route(
+            "/graphql",
+            post({
+                let schema = schema.clone();
+                move |req: GraphQLRequest| async move {
+                    GraphQLResponse::from(schema.execute(req.into_inner()).await)
+                }
+            }),
+        )
+        .route(
+            "/graphql",
+            get({
+                let schema = schema.clone();
+                move || async move { axum::Json(schema.sdl()) }
+            }),
+        );
+
+    let addr = SocketAddr::from(([0, 0, 0, 0], 3000));
+    println!("listening on http://{}", addr);
+
+    axum::serve(
+        tokio::net::TcpListener::bind(addr).await.unwrap(),
+        app.into_make_service(),
+    )
+    .await
+    .unwrap();
+    Ok(())
 }