cache node_modules if possible

Dockerfile

@@ -1,4 +1,15 @@
-# Stage 1: Build the Vite React app
+# Stage 1: Dependencies install (cached if lockfile unchanged)
+FROM node:22-alpine AS deps
+
+WORKDIR /app
+
+# Only copy dependency-related files to leverage cache
+COPY package.json yarn.lock ./
+
+# Install dependencies
+RUN yarn install --frozen-lockfile
+
+# Stage 2: Build the app
 FROM node:22-alpine AS builder
 
 ARG VITE_API_URL
@@ -6,15 +17,25 @@ ENV VITE_API_URL=$VITE_API_URL
 
 WORKDIR /app
 
-# Install dependencies
-COPY package.json /app
-COPY yarn.lock /app
-RUN yarn install
+# Copy deps from previous stage to cache node_modules
+COPY --from=deps /app/node_modules ./node_modules
+COPY --from=deps /app/package.json ./package.json
+COPY --from=deps /app/yarn.lock ./yarn.lock
 
-COPY . .
+# Copy rest of app
+COPY src/ ./src
+COPY public/ ./public
+COPY .env.production ./.env.production
+COPY index.html ./index.html
+COPY tsconfig.json ./tsconfig.json
+COPY tsconfig.app.json ./tsconfig.app.json
+COPY tsconfig.node.json ./tsconfig.node.json
+COPY vite.config.ts ./vite.config.ts
+
+# Build the Vite app
 RUN yarn build
 
-# Stage 2: Serve with Caddy
+# Stage 3: Serve with Caddy
 FROM caddy:alpine
 
 # Copy built app to the web root