Adjust CI pipeline.

docker/Dockerfile

@@ -1,23 +1,25 @@
-FROM node:18-alpine AS builder
-
-# Set working directory
+FROM node:20-slim AS base
+ENV PNPM_HOME="/pnpm"
+ENV PATH="$PNPM_HOME:$PATH"
+RUN corepack enable
+COPY . /app
 WORKDIR /app
 
-# Copy package.json and install dependencies
-COPY package.json pnpm-lock.yaml ./
-RUN npm ci
+FROM base AS prod-deps
+RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --prod --frozen-lockfile
 
-# Copy the rest of the app and build
-COPY . .
-RUN npm run build
+FROM base AS build
+RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
+RUN pnpm run build
 
 # Stage 2: Minimal image for exporting build artifacts
 FROM alpine:latest
 
 # Set working directory for output
-WORKDIR /output
+WORKDIR /app
 
 # Copy the built files from the builder stage
-COPY --from=builder /app/build .
+COPY --from=prod-deps /app/node_modules /app/node_modules
+COPY --from=build /app/build .
 
 # No CMD because this image is just used to extract build files