Enable auth-service/api-gateway on production, build their images in CI

apps/api-gateway/src/config.ts

@@ -0,0 +1,11 @@
+export interface Settings {
+  port: number;
+  authServiceUrl: string;
+}
+
+export function loadSettings(): Settings {
+  return {
+    port: Number(process.env.PORT ?? 3000),
+    authServiceUrl: process.env.AUTH_SERVICE_URL ?? "http://localhost:3010",
+  };
+}