Added Linting on Docker also

Author: NalinDalal

Dockerfile

@@ -6,10 +6,25 @@ WORKDIR /async
 # Install development dependencies
 COPY package.json package-lock.json ./
 RUN npm install
+# Install dependencies
+RUN npm ci
 
 # Copy the rest of the application files
 COPY . .
 
+
+# Run linting during build to catch errors early
+RUN npm run lint || exit 1
+
+# Use a separate production stage to keep the image lightweight
+FROM node:18-alpine AS development
+
+# Set working directory
+WORKDIR /async
+
+# Copy node_modules and built files from builder stage
+COPY --from=builder /async /async
+
 # Expose the port for development (if needed)
 EXPOSE 3000