chore(docker): update Dockerfile to use Node.js 20 and streamline build process

Author: jinzcdev

Dockerfile

@@ -1,5 +1,4 @@
-# Generated by https://smithery.ai. See: https://smithery.ai/docs/config#dockerfile
-FROM node:lts-alpine
+FROM node:20-alpine AS builder
 
 # Create app directory
 WORKDIR /app
@@ -16,12 +15,21 @@ COPY . .
 # Build the application
 RUN npm run build
 
+# Use Node.js 20 Alpine as the base image for the runtime stage
+FROM node:20-alpine AS runner
+
+# Set the working directory for the runtime stage
+WORKDIR /app
+
+# Copy the built application and dependencies from the builder stage
+COPY --from=builder /app/package*.json ./
+COPY --from=builder /app/build ./build
+
+RUN npm install --ignore-scripts --omit=dev
+
+# Define environment variables
 ENV LEETCODE_SITE=global \
     LEETCODE_SESSION=
 
-# Expose any port if needed (MCP uses stdio, so not required for now)
-
 # Set the default command
-CMD node build/index.js \
-    --site ${LEETCODE_SITE:-global} \
-    --session ${LEETCODE_SESSION}
+ENTRYPOINT ["node","build/index.js"]