fix: add explicit DNS resolvers to frontend Dockerfile for BuildKit

BuildKit sandbox does not inherit cluster DNS, causing npm ci to fail
with EAI_AGAIN. Inject Google/Cloudflare DNS into resolv.conf before
running npm ci.

frontend/Dockerfile

@@ -3,7 +3,7 @@
 FROM registry.celestium.life/dockerhub-cache/library/node:24-alpine AS build
 WORKDIR /app
 COPY package.json package-lock.json ./
-RUN npm ci
+RUN echo "nameserver 8.8.8.8" > /etc/resolv.conf && echo "nameserver 1.1.1.1" >> /etc/resolv.conf && npm ci
 COPY . .
 ARG VITE_QUERY_API_URL=""
 ARG VITE_SYMBOL_REGISTRY_URL=""