Docker image hardened, seems to be working stable

Dockerfile

@@ -1,8 +1,14 @@
 FROM python:3.13-slim
 
-# Install FFmpeg and dependencies (gosu will be downloaded separately)
+# Install FFmpeg and dependencies required for gosu installation
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends ffmpeg ca-certificates wget gpg && \
+    apt-get install -y --no-install-recommends \
+        ffmpeg \
+        ca-certificates \
+        wget \
+        gnupg \
+        dirmngr \
+        gnupg-agent && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
@@ -47,5 +53,5 @@ RUN chmod +x /usr/local/bin/docker-entrypoint.sh
 # Set the entrypoint
 ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
 
-# Default command (shows help if no arguments)
-CMD ["audio_splitter", "--help"]
+# Default command (shows help if no arguments provided)
+CMD ["--help"]