#1 Use pre-defined OS and Python Packages list

Dockerfile

@@ -1,41 +1,45 @@
-# Use Ubuntu 22.04 LTS as the base image
+# Use Ubuntu as the base image
 FROM ubuntu:22.04
 
 # Set the working directory in the container
 WORKDIR /app
 
-# Install Python 3.12, build tools, and required dependencies
+# Copy the installed_packages.txt file from the host to the container
+COPY installed_packages.txt /app/installed_packages.txt
+
+# Update the package lists and install system-level packages from the host
+RUN apt-get update && \
+    apt-get install -y dselect && \
+    dpkg --set-selections < /app/installed_packages.txt && \
+    apt-get dselect-upgrade -y && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy the requirements.txt file from the host
+COPY requirements.txt /app/requirements.txt
+
+# Install Python 3.12 and create a virtual environment
 RUN apt-get update && apt-get install -y \
     python3.12 \
     python3.12-venv \
-    build-essential \
-    cmake \
-    g++ \
-    gcc \
-    python3-dev \
-    libstdc++6 \
     && rm -rf /var/lib/apt/lists/*
 
-# Copy the current directory contents into the container at /app
-COPY . /app
-
-# Create the ots virtual environment using Python's built-in venv tool
+# Create the Python virtual environment using Python 3.12
 RUN python3.12 -m venv /app/ots
 
-# Copy the requirements.txt file
-COPY requirements.txt /app/requirements.txt
-
-# Install the dependencies in the ots environment
+# Install Python dependencies from requirements.txt
 RUN /app/ots/bin/pip install --no-cache-dir --upgrade pip
 RUN /app/ots/bin/pip install --no-cache-dir -r /app/requirements.txt
 
+# Copy the rest of the app's code into the container
+COPY . /app
+
 # Make the start.sh script executable
 RUN chmod +x /app/start.sh
 
 # Expose port 8002
 EXPOSE 8002
 
-# Define environment variable
+# Set environment variable
 ENV PYTHONUNBUFFERED=1
 
 # Run the start script using the ots environment