Change server listening port to 80 for production deployment

server.js

@@ -158,7 +158,7 @@ app.get('/api/poi', async (req, res) => {
       SELECT 
         id, 
         ST_AsGeoJSON(ST_Transform(geom, 4326)) as geometry
-      FROM "netzverknüpfungspunkt"
+      FROM netzverknüpfungspunkt
     `;
     const result = await client.query(query);
     const geojson = {
@@ -320,6 +320,7 @@ app.patch('/api/owners/:id', async (req, res) => {
   }
 });
 
-app.listen(3000, () => {
-  console.log(`Server running at http://localhost:3000`);
+const PORT = process.env.PORT || 80;
+app.listen(PORT, '0.0.0.0', () => {
+  console.log(`Server running on port ${PORT}`);
 });