Update Dockerfile

Dockerfile

@@ -25,6 +25,9 @@ RUN apt-get update && apt-get install -y \
     libgtk-3-0 \
     --no-install-recommends
 
+# Clean up APT when done
+RUN apt-get clean && rm -rf /var/lib/apt/lists/*
+
 # Create a non-root user and set the environment path
 RUN useradd -m -u 1000 user
 USER user