Refactor Dockerfile to use alpine base image and streamline dependencies; update workflows to handle artifact downloads and extraction

Dockerfile

@@ -1,17 +1,10 @@
-FROM python:3.12-slim
+FROM python:3.12-alpine
 
 WORKDIR /app
 
-# Install runtime dependencies: aria2, ffmpeg, yt-dlp
-# Use --no-install-recommends to keep image small and clean up apt lists
-RUN apt-get update \
-	&& apt-get install -y --no-install-recommends \
-	   ca-certificates \
-	   aria2 \
-	   ffmpeg \
-	   yt-dlp \
-	&& rm -rf /var/lib/apt/lists/*
-
 COPY yt-playlist-main.py /app/
+COPY ./bin/ffmpeg /app/bin
+COPY ./bin/yt-dlp /app/bin
+COPY ./bin/aria2c /app/bin
 
 CMD ["python", "yt-playlist-main.py"]