capitalizing Dockerfile

Dockerfile

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+# Dockerfile
+FROM python:slim
+
+WORKDIR /app
+
+# System deps for archives and video thumbs (all FOSS)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    p7zip-full \
+    unar \
+    file \
+    ffmpeg \
+ && rm -rf /var/lib/apt/lists/*
+
+
+# Install deps first for better layer caching
+COPY requirements.txt .
+RUN pip install --upgrade pip && pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the app
+COPY . .
+
+# Entrypoint controls migrations, background worker, and Gunicorn
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+EXPOSE 5000
+ENTRYPOINT ["/entrypoint.sh"]