chore: import upstream snapshot with attribution

Dockerfile

@@ -0,0 +1,33 @@
+FROM python:3.13-slim-bullseye
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV EXIFTOOL_PATH=/usr/bin/exiftool
+ENV FFMPEG_PATH=/usr/bin/ffmpeg
+
+# Runtime dependency
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg \
+    exiftool
+
+ARG INSTALL_GIT=false
+RUN if [ "$INSTALL_GIT" = "true" ]; then \
+    apt-get install -y --no-install-recommends \
+    git; \
+    fi
+
+# Cleanup
+RUN rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY . /app
+RUN pip --no-cache-dir install \
+    /app/packages/markitdown[all] \
+    /app/packages/markitdown-sample-plugin
+
+# Default USERID and GROUPID
+ARG USERID=nobody
+ARG GROUPID=nogroup
+
+USER $USERID:$GROUPID
+
+ENTRYPOINT [ "markitdown" ]