Add a docker image.

Dockerfile

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+FROM node:20-alpine
+
+# Enable pnpm
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
+# Set working directory
+WORKDIR /app
+
+# Copy files
+COPY . .
+
+# Install dependencies
+RUN pnpm install --frozen-lockfile
+
+# Build the SvelteKit app
+RUN pnpm run build
+
+# Expose default port
+EXPOSE 3000
+
+# Set environment
+ENV NODE_ENV=production
+
+# Start the SvelteKit app
+CMD ["node", "build"]