allow overriding api url

flake.nix

@@ -26,11 +26,11 @@
 
           npmDepsHash = "sha256-2XxcsvKeYp+SVBx6Z2uB/34qUr7AderMxXKjm/kS8F0=";
 
-          API_PORT = "3000";
+          API_URL = "/api";
 
           buildPhase = ''
             runHook preBuild
-            PUBLIC_API_PORT="''${API_PORT}" npm run build
+            PUBLIC_API_URL="''${API_URL}" npm run build
             runHook postBuild
           '';
 

src/routes/+page.ts

@@ -1,12 +1,11 @@
 import type { NetworkStatus } from '$lib/types'
 import type { PageLoad } from './$types'
-import { PUBLIC_API_PORT } from '$env/static/public'
+import { PUBLIC_API_URL } from '$env/static/public'
 
 export const ssr = false
 
-export const load: PageLoad = async ({ fetch, url }) => {
-  const apiUrl = `${url.protocol}//${url.hostname}:${PUBLIC_API_PORT}`
-  const response = await fetch(apiUrl)
+export const load: PageLoad = async ({ fetch }) => {
+  const response = await fetch(PUBLIC_API_URL)
   const networkStatus: NetworkStatus = await response.json()
 
   return {