fix: set CI=true in gatekeeper dockerfile

packages/infra/docker/Dockerfile.gatekeeper

@@ -3,6 +3,7 @@ FROM node:20-alpine AS builder
 RUN apk add --no-cache libc6-compat curl
 WORKDIR /app
 RUN corepack enable pnpm
+ENV CI=true
 
 # Copy manifest files specifically for better layer caching
 COPY pnpm-lock.yaml pnpm-workspace.yaml package.json .npmrc ./