fix(portal): ensure public directory exists for docker runner stage

Dockerfile

@@ -10,6 +10,7 @@ FROM base AS builder
 WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
+RUN mkdir -p public
 ENV NEXT_TELEMETRY_DISABLED=1
 ENV NEXT_PUBLIC_SUPABASE_URL=https://supabase.4ventures.es
 ENV NEXT_PUBLIC_SUPABASE_ANON_KEY=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE3NzIzMTgzMTAsImV4cCI6MTg5MzQ1NjAwMCwicm9sZSI6ImFub24iLCJpc3MiOiJzdXBhYmFzZSJ9.UWNn1leZNljna9Qwi9U5RtGqsh5_SnEoiPO8HkQIgi8