app: Allow to configure the API base url

app/src/main.rs

@@ -10,6 +10,17 @@ use crate::sidebar::RegaladeSidebar;
 
 mod sidebar;
 
+const API_ROUTE: &str = match option_env!("REGALADE_API_SERVER_BASE") {
+    None => "http://localhost:8085",
+    Some(v) => v,
+};
+
+macro_rules! api {
+    ($($arg:tt)*) => {
+        &format!("{API_ROUTE}/api/{}", format_args!($($arg)*))
+    };
+}
+
 #[derive(Routable, Debug, Clone, Copy, PartialEq, Eq)]
 enum Route {
     #[at("/")]
@@ -150,7 +161,7 @@ fn switch(route: Route) -> Html {
 }
 
 async fn do_login(username: String, password: String) -> anyhow::Result<()> {
-    let rsp = gloo_net::http::Request::post("http://localhost:8085/api/login")
+    let rsp = gloo_net::http::Request::post(api!("login"))
         .json(&LoginRequest { username, password })?
         .send()
         .await?;