Reduce Docker image size using multi-stage builds

Dockerfile.alpine

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+FROM python:3.12-alpine AS base
+
+ENV PIP_VERSION=25.3
+ENV REQUESTS_VERSION=2.32.5
+ENV PYTHONUNBUFFERED=1
+ENV PYTHONDONTWRITEBYTECODE=1
+
+# Install system dependencies including mono
+RUN apk add --no-cache \
+    ca-certificates \
+    curl \
+    ffmpeg \
+    gcompat \
+    icu-libs \
+    libgdiplus \
+    mediainfo \
+    mktorrent \
+    mono \
+    nano \
+    && update-ca-certificates
+
+# Setup venv
+FROM base AS builder-venv
+
+# Install build dependencies
+RUN apk add --no-cache \
+    cargo \
+    gcc \
+    git \
+    g++ \
+    linux-headers \
+    musl-dev \
+    python3-dev
+
+COPY requirements.txt /tmp/requirements.txt
+
+# Python venv setup
+RUN python -m venv /venv
+ENV PATH="/venv/bin:$PATH"
+
+# Install requirements
+RUN pip install --no-cache-dir --upgrade pip==${PIP_VERSION} && \
+    pip install --no-cache-dir -r /tmp/requirements.txt
+
+# Finalize app directory in seperate build stage
+FROM base AS builder-app
+
+# Copy virtual environment
+COPY --from=builder-venv /venv /venv
+ENV PATH="/venv/bin:$PATH"
+
+# Install requests (for DVD MediaInfo download)
+RUN pip install --upgrade requests==${REQUESTS_VERSION}
+
+WORKDIR /Upload-Assistant
+
+# Copy app into container
+COPY . .
+
+# Run DVD MediaInfo download script
+RUN python3 bin/get_dvd_mediainfo_docker.py
+
+# Download only the required mkbrr binary (requires full repo for src imports)
+RUN python3 -c "from bin.get_mkbrr import MkbrrBinaryManager; MkbrrBinaryManager.download_mkbrr_for_docker()"
+
+# Download bdinfo binary for the container architecture using the docker helper
+RUN python3 bin/get_bdinfo_docker.py
+
+RUN chown -R 1000:1000 /Upload-Assistant/bin/mkbrr \
+    && chown -R 1000:1000 /Upload-Assistant/bin/MI \
+    && chown -R 1000:1000 /Upload-Assistant/bin/bdinfo \
+    && chmod -R +rx /Upload-Assistant/bin/mkbrr \
+    && chmod -R +rx /Upload-Assistant/bin/MI \
+    && chmod -R +rx /Upload-Assistant/bin/bdinfo
+
+# Create tmp directory with appropriate permissions
+RUN mkdir -p /Upload-Assistant/tmp && chmod 1777 /Upload-Assistant/tmp
+ENV TMPDIR=/Upload-Assistant/tmp
+
+# START BUILDING SLIM IMAGE
+FROM base
+
+# Copy venv
+COPY --from=builder-venv /venv /venv
+ENV PATH="/venv/bin:$PATH"
+
+# Copy application
+COPY --from=builder-app /Upload-Assistant /Upload-Assistant
+
+WORKDIR /Upload-Assistant
+
+EXPOSE 5000
+
+STOPSIGNAL SIGTERM
+
+# Health check for WebUI mode — ignored when running CLI
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD curl -sf http://localhost:5000/api/health || exit 1
+
+ENTRYPOINT ["python", "/Upload-Assistant/upload.py"]
+
+# Default: show help when no arguments are provided
+CMD ["-h"]