Create nixpacks.json

nixpacks.json

@@ -0,0 +1,16 @@
+{
+  "phases": {
+    "setup": {
+      "nixPkgs": ["nodejs", "npm"]
+    },
+    "install": {
+      "cmds": ["npm ci"]
+    },
+    "build": {
+      "cmds": ["npm run build"]
+    }
+  },
+  "start": {
+    "cmd": "npm run preview -- --host 0.0.0.0 --port $PORT"
+  }
+}