chore: use base image

examples/fastify-api-reference/Dockerfile

@@ -1,21 +1,5 @@
-FROM node:18-bullseye AS base
-
-RUN npm install pnpm@8 --global
-RUN pnpm config set store-dir ~/.pnpm-store
-
-WORKDIR /app
-
-# Copy and build all packages to share across example builds
-COPY pnpm-lock.yaml .
-COPY pnpm-workspace.yaml .
-COPY package.json .
-COPY tsconfig.json .
-COPY turbo.json .
-COPY packages ./packages
-RUN pnpm install
-RUN pnpm build:packages
-FROM base AS builder
-# FROM ${BASE_IMAGE} AS builder
+ARG BASE_IMAGE
+FROM ${BASE_IMAGE} AS builder
 WORKDIR /app
 
 # Install dumb-init - minimal process init system