Enable auth-service/api-gateway on production, build their images in CI

apps/api-gateway/Dockerfile

@@ -0,0 +1,21 @@
+FROM node:20-slim AS base
+RUN corepack enable
+WORKDIR /repo
+
+FROM base AS deps
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
+COPY apps/api-gateway/package.json apps/api-gateway/package.json
+COPY packages/config/package.json packages/config/package.json
+RUN pnpm install --frozen-lockfile
+
+FROM deps AS build
+COPY packages/ packages/
+COPY apps/api-gateway/ apps/api-gateway/
+RUN pnpm --filter @duoc-thu/api-gateway build
+
+FROM base AS runtime
+ENV NODE_ENV=production
+COPY --from=build /repo /repo
+WORKDIR /repo/apps/api-gateway
+EXPOSE 3000
+CMD ["node", "dist/main.js"]