feat: add ffprobe and mkvmerge to docker image + requirements

Dockerfile

@@ -1,7 +1,29 @@
-FROM python:3.13.3-alpine
+FROM debian:bullseye-slim AS builder
+
+# Install ffmpeg and mkvtoolnix
+# but only keep the binaries and libs for ffprobe and mkvmerge
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg mkvtoolnix \
+    && mkdir -p /artifacts/bin /artifacts/lib \
+    && cp $(which ffprobe) /artifacts/bin/ \
+    && cp $(which mkvmerge) /artifacts/bin/ \
+    && ldd $(which ffprobe) | awk '{print $3}' | xargs -I '{}' cp -v '{}' /artifacts/lib/ || true \
+    && ldd $(which mkvmerge) | awk '{print $3}' | xargs -I '{}' cp -v '{}' /artifacts/lib/ || true
+
+# Must be the same base as builder image for shared libraries compatibility
+FROM python:3.13.3-slim-bullseye
+
+COPY --from=builder /artifacts/bin/* /usr/local/bin/
+COPY --from=builder /artifacts/lib/* /usr/local/lib/
+ENV LD_LIBRARY_PATH=/usr/local/lib
 
 WORKDIR /app
 
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
 COPY . .
 
-CMD ["python3.13", "src/server.py"]
+EXPOSE 8000
+
+CMD ["python", "src/server.py"]

requirements.txt

@@ -0,0 +1 @@
+watchdog==6.0.0