fix build time environment variables

scripts/deploy/sync-env-from-server.sh

@@ -60,6 +60,10 @@ for service in "$@"; do
     service_var=$(echo "${service}" | tr '[:lower:]-' '[:upper:]_')
     echo "${service_var}_PORT=${port_value}" >> "${GITHUB_ENV}"
     echo "Exported ${service_var}_PORT from ${src}"
+
+    # Forward NEXT_PUBLIC_* vars so docker compose build can inject them as build args.
+    grep -E '^[[:space:]]*NEXT_PUBLIC_[A-Za-z0-9_]+=' "${src}" \
+      | sed -E 's/^[[:space:]]*//' >> "${GITHUB_ENV}" || true
   fi
 done