update dockerfile for raspberry pi

Dockerfile

@@ -1,14 +1,19 @@
+# Use Alpine for a smaller image
 FROM python:3.11-alpine
 
+# Set working directory
 WORKDIR /app
 
+# Install build dependencies for TA-Lib
 RUN apk add --no-cache \
     build-base \
     wget \
     tar \
     bash \
-    libffi-dev \
-    && wget http://prdownloads.sourceforge.net/ta-lib/ta-lib-0.4.0-src.tar.gz \
+    libffi-dev
+
+# Download, extract, and compile TA-Lib (ARM compatible)
+RUN wget http://prdownloads.sourceforge.net/ta-lib/ta-lib-0.4.0-src.tar.gz \
     && tar -xvzf ta-lib-0.4.0-src.tar.gz \
     && cd ta-lib \
     && ./configure --prefix=/usr \
@@ -17,10 +22,17 @@ RUN apk add --no-cache \
     && cd .. \
     && rm -rf ta-lib ta-lib-0.4.0-src.tar.gz
 
+# Copy the requirements file first (for caching layers)
 COPY requirements.txt .
+
+# Install Python dependencies, including `ta-lib`
 RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the project
 COPY . .
 
+# Expose Streamlit's default port
 EXPOSE 8501
 
+# Run Streamlit in headless mode
 CMD ["streamlit", "run", "src/streamlit_app.py", "--server.headless=true", "--server.port=8501"]