fix: consolidate system dependency installation and remove redundant command

Dockerfile

@@ -2,28 +2,25 @@ FROM python:3.11-slim
 
 WORKDIR /app
 
-# Install base system dependencies
+# Combine all system dependency installations into a single RUN command
+# This ensures apt-get update runs every time a new package is added.
 RUN apt-get update && apt-get install -y \
     build-essential \
     curl \
     software-properties-common \
     git \
+    libgl1-mesa-glx \
     && rm -rf /var/lib/apt/lists/*
 
-# === THIS IS THE NEW LINE TO FIX THE ERROR ===
-# Force install the missing library required by OpenCV
-RUN apt-get install -y libgl1-mesa-glx
-# ============================================
-
-# Copy and install Python requirements
+# Copy requirements and install Python packages
 COPY requirements.txt ./
 COPY src/ ./src/
-RUN pip3 install -r requirements.txt
+RUN pip3 install --no-cache-dir -r requirements.txt
 
-# Expose the port Streamlit will run on
+# Expose the Streamlit port
 EXPOSE 8501
 
-# Healthcheck to ensure the app is responsive
+# Healthcheck to see if the app is responsive
 HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health
 
 # Command to run the Streamlit application