Update Dockerfile

Dockerfile

@@ -8,8 +8,9 @@ ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
 ENV MPLCONFIGDIR=/tmp/matplotlib-cache
 
-# Create cache directories
-RUN mkdir -p /tmp/voices /tmp/output $MPLCONFIGDIR && chmod 777 /tmp/voices /tmp/output $MPLCONFIGDIR
+# Create cache directories first (this helps with caching)
+RUN mkdir -p /tmp/voices /tmp/output /tmp/matplotlib-cache && \
+    chmod 777 /tmp/voices /tmp/output /tmp/matplotlib-cache
 
 # Install system dependencies
 RUN apt-get update && apt-get install -y \
@@ -18,6 +19,9 @@ RUN apt-get update && apt-get install -y \
     libsndfile1 \
     && rm -rf /var/lib/apt/lists/*
 
+# Upgrade pip to handle dependency resolution better
+RUN pip install --upgrade pip
+
 # Copy requirements first for better caching
 COPY requirements.txt .