Add build web script

scripts/build_web.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+set -e
+
+cd "$(dirname "$0")"/..
+
+# Paths
+ROOT_ENV=".env"           # your root .env
+WEB_ENV="web/.env"        # target for frontend
+
+# Backup existing web/.env if it exists
+if [ -f "$WEB_ENV" ]; then
+  cp "$WEB_ENV" "${WEB_ENV}.bak"
+  echo "Backed up existing $WEB_ENV to ${WEB_ENV}.bak"
+fi
+
+# Filter NEXT_PUBLIC_* lines
+grep '^NEXT_PUBLIC_' "$ROOT_ENV" > "$WEB_ENV"
+
+echo "Copied NEXT_PUBLIC_ variables to $WEB_ENV:"
+
+echo "NEXT_PUBLIC_FIREBASE_ENV=prod" >> "$WEB_ENV"
+
+cat "$WEB_ENV"
+
+cd web
+
+yarn build
+
+