ADD: Production multi-stage Dockerfile and .dockerignore

.dockerignore

@@ -0,0 +1,14 @@
+node_modules
+npm-debug.log
+logs
+./logs
+.git
+.gitignore
+.github
+.idea
+.vscode
+.env
+./config/.env
+Dockerfile*
+.dockerignore
+README.md

Dockerfile

@@ -1,20 +1,35 @@
-# Use the official Node.js image as a base
-FROM node:18
+# Stage 1: Build & install production dependencies
+FROM node:20-alpine AS dependencies
 
-# Set the working directory in the container
 WORKDIR /app
 
-# Copy package.json and package-lock.json to the container
 COPY package*.json ./
 
-# Install dependencies
-RUN npm install
+RUN npm ci --omit=dev --ignore-scripts && npm cache clean --force
 
-# Copy the rest of the application code
-COPY . .
+# Stage 2: Production runner
+FROM node:20-alpine AS runner
 
-# Expose the application port
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=3000
+
+# Install dumb-init for robust signal handling (PID 1)
+RUN apk add --no-cache dumb-init && mkdir -p /app/uploads && chown -R node:node /app
+
+# Switch to non-root user
+USER node
+
+# Copy production node_modules with ownership
+COPY --chown=node:node --from=dependencies /app/node_modules ./node_modules
+
+# Copy application source code with ownership
+COPY --chown=node:node . .
+
+# Expose backend port
 EXPOSE 3000
 
-# Start the application
-CMD ["npm", "start"]
+# Run container with dumb-init
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+CMD ["node", "app.js"]