Update Dockerfile

Dockerfile

@@ -1,7 +1,7 @@
 # Use the official Python image (non-slim to include full libraries)
 FROM python:3.9
 
-# Prevent Python from writing pyc files and enable unbuffered output
+# Prevent Python from writing .pyc files and enable unbuffered output
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
 
@@ -15,6 +15,9 @@ RUN apt-get update && apt-get install -y \
     && ln -s /usr/bin/wkhtmltopdf /usr/local/bin/wkhtmltopdf \
     && rm -rf /var/lib/apt/lists/*
 
+# Add /usr/local/bin to PATH so that 'dot' is found
+ENV PATH="/usr/local/bin:${PATH}"
+
 # Set working directory
 WORKDIR /app