Update Dockerfile

Dockerfile

@@ -6,13 +6,14 @@ FROM node:20-slim
 RUN apt-get update && apt-get install -y --no-install-recommends libheif-dev libavif-dev libheif-examples
 
 # Set the working directory.
-WORKDIR /app
+WORKDIR /usr/src/app
 
 # Copy the dependency files.
 COPY package*.json ./
 
 # Install Node.js dependencies.
 RUN npm install
+RUN npm install -g pm2
 
 # Copy the rest of the application files.
 COPY . .
@@ -20,5 +21,5 @@ COPY . .
 # Expose the port your app runs on.
 EXPOSE 7860
 
-# Command to run the application.
-CMD [ "node", "server.js" ]
+# Command to run the application using PM2 to spin up 4 workers.
+CMD [ "pm2-runtime", "start", "server.js", "-i", "4" ]