Update dockerfile

Dockerfile

@@ -1,10 +1,13 @@
 # =========================================
 # Stage 1: Build the TanStack Start Application
 # =========================================
-ARG NODE_VERSION=24.12.0-alpine
+ARG NODE_VERSION=24.12.0-slim
 
 # Use a lightweight Node.js image for building (customizable via ARG)
 FROM node:${NODE_VERSION} AS builder
+ENV PNPM_HOME="/pnpm"
+ENV PATH="$PNPM_HOME:$PATH"
+RUN corepack enable
 
 # Set the working directory inside the container
 WORKDIR /app