feat: add Dockerfile and GitHub Actions workflow for building and publishing Docker image

Dockerfile

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+FROM python:3.12-slim
+
+# Set environment variables to reduce image size
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    UV_CACHE_DIR=/tmp/uv-cache
+
+# Add container metadata
+LABEL org.opencontainers.image.description="Docker image for Unshackle with all required dependencies for downloading media content"
+
+# Install base dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    wget \
+    gnupg \
+    git \
+    curl \
+    build-essential \
+    cmake \
+    pkg-config \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set up repos for mkvtools and bullseye for ccextractor
+RUN wget -O /etc/apt/keyrings/gpg-pub-moritzbunkus.gpg https://mkvtoolnix.download/gpg-pub-moritzbunkus.gpg \
+    && echo "deb [signed-by=/etc/apt/keyrings/gpg-pub-moritzbunkus.gpg] https://mkvtoolnix.download/debian/ bookworm main" >> /etc/apt/sources.list \
+    && echo "deb-src [signed-by=/etc/apt/keyrings/gpg-pub-moritzbunkus.gpg] https://mkvtoolnix.download/debian/ bookworm main" >> /etc/apt/sources.list \
+    && echo "deb http://ftp.debian.org/debian bullseye main" >> /etc/apt/sources.list
+
+# Install all dependencies from apt
+RUN apt-get update && apt-get install -y \
+    ffmpeg \
+    ccextractor \
+    mkvtoolnix \
+    aria2 \
+    libmediainfo-dev \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install shaka packager
+RUN wget https://github.com/shaka-project/shaka-packager/releases/download/v3.4.1/packager-linux-x64 \
+    && chmod +x packager-linux-x64 \
+    && mv packager-linux-x64 /usr/local/bin/packager
+
+# Install N_m3u8DL-RE
+RUN wget https://github.com/nilaoda/N_m3u8DL-RE/releases/download/v0.3.0-beta/N_m3u8DL-RE_v0.3.0-beta_linux-x64_20241203.tar.gz \
+    && tar -xzf N_m3u8DL-RE_v0.3.0-beta_linux-x64_20241203.tar.gz \
+    && mv N_m3u8DL-RE /usr/local/bin/ \
+    && chmod +x /usr/local/bin/N_m3u8DL-RE \
+    && rm N_m3u8DL-RE_v0.3.0-beta_linux-x64_20241203.tar.gz
+
+# Create binaries directory and add symlinks for all required executables
+RUN mkdir -p /app/binaries && \
+    ln -sf /usr/bin/ffprobe /app/binaries/ffprobe && \
+    ln -sf /usr/bin/ffmpeg /app/binaries/ffmpeg && \
+    ln -sf /usr/bin/mkvmerge /app/binaries/mkvmerge && \
+    ln -sf /usr/local/bin/N_m3u8DL-RE /app/binaries/N_m3u8DL-RE && \
+    ln -sf /usr/local/bin/packager /app/binaries/packager && \
+    ln -sf /usr/local/bin/packager /usr/local/bin/shaka-packager && \
+    ln -sf /usr/local/bin/packager /usr/local/bin/packager-linux-x64
+
+# Install uv
+RUN pip install --no-cache-dir uv
+
+# Set working directory
+WORKDIR /app
+
+# Copy dependency files and README (required by pyproject.toml)
+COPY pyproject.toml uv.lock README.md ./
+
+# Copy source code first
+COPY unshackle/ ./unshackle/
+
+# Install dependencies with uv (including the project itself)
+RUN uv sync --frozen --no-dev
+
+# Set entrypoint to allow passing commands directly to unshackle
+ENTRYPOINT ["uv", "run", "unshackle"]
+CMD ["-h"]