feat: multi stage dockerfile

api/Dockerfile

@@ -1,23 +1,58 @@
-# Dockerfile
-FROM python:3.12-slim
+# Multi-stage Dockerfile
+# Stage 1: Builder - Install Python dependencies
+FROM python:3.12-slim AS builder
 
 WORKDIR /app
 
+# Install git in builder stage (needed for pip install from git)
 RUN apt-get update && apt-get install -y \
     git \
-    ffmpeg \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy and install requirements
 COPY requirements.txt .
 
-RUN pip install --no-cache-dir -r requirements.txt
+# Install dependencies to user directory for easy copying
+RUN pip install --user --no-cache-dir -r requirements.txt && \
+    # Clean up pip cache after installation
+    rm -rf /root/.cache/pip
 
 # Force reinstall of pipecat on every build (cache bust)
-ARG CACHEBUST=1
-RUN pip install 'git+https://github.com/dograh-hq/pipecat.git@main#egg=pipecat-ai[cartesia,deepgram,openai,elevenlabs,groq,google,azure]'
 
+ARG CACHEBUST=1
+RUN pip install --user 'git+https://github.com/dograh-hq/pipecat.git@main#egg=pipecat-ai[cartesia,deepgram,openai,elevenlabs,groq,google,azure]' && \
+    # Clean up pip cache after pipecat installation
+    rm -rf /root/.cache/pip
+
+# Remove unnecessary Python cache files from installed packages
+RUN find /root/.local -type f -name '*.pyc' -delete && \
+    find /root/.local -type d -name '__pycache__' -delete && \
+    find /root/.local -type f -name '*.pyo' -delete
+
+# Stage 2: Runtime - Minimal image with only runtime dependencies
+FROM python:3.12-slim AS runner
+
+WORKDIR /app
+
+# Only install ffmpeg (runtime dependency)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy Python packages from builder stage
+COPY --from=builder /root/.local /root/.local
+
+# Make sure scripts in .local are available
+ENV PATH=/root/.local/bin:$PATH
+
+# Set Python to not generate .pyc files in runtime
+ENV PYTHONDONTWRITEBYTECODE=1
+# Unbuffered output for better container logging
+ENV PYTHONUNBUFFERED=1
+
+# Copy application code
 COPY . ./api
 
 ENV PYTHONPATH=/app