Update Dockerfile

Dockerfile

@@ -1,37 +1,27 @@
-# Dockerfile
-FROM node:16
-
-# Install latest chrome dev package and fonts to support major charsets
-RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - \
-    && sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' \
-    && apt-get update \
-    && apt-get install -y google-chrome-stable fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst fonts-freefont-ttf libxss1 \
-    --no-install-recommends \
-    && rm -rf /var/lib/apt/lists/*
+# Use Node.js LTS (Long Term Support) version
+FROM node:20-slim
 
+# Create app directory
 WORKDIR /usr/src/app
 
-# Add user so we don't need --no-sandbox.
-RUN groupadd -r pptruser && useradd -r -g pptruser -G audio,video pptruser \
-    && mkdir -p /home/pptruser/Downloads \
-    && chown -R pptruser:pptruser /home/pptruser
-
 # Install app dependencies
+# A wildcard is used to ensure both package.json AND package-lock.json are copied
 COPY package*.json ./
+
+# Install dependencies
 RUN npm install
 
 # Bundle app source
 COPY . .
 
-# Set correct permissions
-RUN chown -R pptruser:pptruser /usr/src/app
-
-# Create a directory for temporary files with correct permissions
-RUN mkdir -p /tmp/marp-work && chown -R pptruser:pptruser /tmp/marp-work && chmod -R 777 /tmp/marp-work
+# Create a directory for uploaded files if needed
+#RUN mkdir -p public
 
-# Run everything after as non-privileged user.
-USER pptruser
+# Your app binds to port 3000 so you'll use the EXPOSE instruction to have it mapped by the docker daemon
+EXPOSE 3000
 
-EXPOSE 7860
+# Define environment variable
+ENV PORT=3000
 
-CMD ["node", "index.js"]
+# Command to run the application
+CMD [ "node", "index.js" ]