Update Dockerfile

Dockerfile

@@ -2,25 +2,27 @@
 FROM node:14-bullseye-slim as build-step
 WORKDIR /app
 ENV PATH /app/node_modules/.bin:$PATH
-RUN mkdir ./frontend
+
+# Copy package.json and package-lock.json first to leverage Docker cache
 COPY ./frontend/package.json ./frontend/package-lock.json ./frontend/
 WORKDIR /app/frontend
 RUN npm install -g [email protected]
 RUN npm install
 
-WORKDIR /app
+# Copy the rest of the frontend code and build the project
 COPY ./frontend ./frontend
-
 WORKDIR /app/frontend
 RUN npm run build
 
-FROM python:3.10.13-slim-bullseye 
+# Step #2: set up the Python backend and Nginx
+FROM python:3.10.13-slim-bullseye
 RUN apt-get update && apt-get install -y nginx \
     && rm -rf /var/lib/apt/lists/*
 
 RUN python3 -m pip install --upgrade pip \
     && pip install gunicorn==20.1.0
 
+# Copy backend code and install dependencies
 COPY ./backend ./backend
 RUN pip install -r ./backend/requirements.txt
 
@@ -30,7 +32,7 @@ RUN chmod -R 755 /var/log/nginx && \
     mkdir -p /var/lib/nginx/body && \
     chown -R root:root /var/log/nginx /var/lib/nginx /usr/share/nginx/html
 
-# Step #3: configure nginx and flask
+# Step #3: configure Nginx and Flask
 COPY --from=build-step /app/frontend/build /usr/share/nginx/html
 COPY deployment/docker/nginx.conf /etc/nginx/nginx.conf  # Copy main nginx.conf
 COPY deployment/docker/serve.sh .