Refactor Dockerfile and entrypoint script for improved configuration handling and streamline image setup

Dockerfile

@@ -2,9 +2,22 @@ FROM python:3.12-alpine
 
 WORKDIR /app
 
+# Copy application code (package) and bootstrap
 COPY yt-playlist-main.py /app/
-COPY ./bin/ffmpeg /app/bin
-COPY ./bin/yt-dlp /app/bin
-COPY ./bin/aria2c /app/bin
+COPY ytplaylist/ /app/ytplaylist/
+COPY config/ /app/config/
 
-CMD ["python","-m","ytplaylist.cli"]
+# Copy helper binaries into a bin/ folder inside the image
+COPY ./bin/ffmpeg /app/bin/ffmpeg
+COPY ./bin/yt-dlp /app/bin/yt-dlp
+COPY ./bin/aria2c /app/bin/aria2c
+
+# Copy entrypoint that maps environment variables to CLI flags
+COPY docker-entrypoint.sh /app/docker-entrypoint.sh
+RUN chmod +x /app/docker-entrypoint.sh && chmod +x /app/bin/* || true
+
+# Put the bundled bin directory first in PATH
+ENV PATH="/app/bin:${PATH}"
+
+ENTRYPOINT ["/app/docker-entrypoint.sh"]
+CMD [""]