feat: enable Git support in devcontainer (#136)

Co-authored-by: gagb <gagb@users.noreply.github.com>

Dockerfile

@@ -2,10 +2,15 @@ FROM python:3.13-slim-bullseye
 
 USER root
 
+ARG INSTALL_GIT=false
+RUN if [ "$INSTALL_GIT" = "true" ]; then \
+    apt-get update && apt-get install -y git && rm -rf /var/lib/apt/lists/*; \
+    fi
+
 # Runtime dependency
 RUN apt-get update && apt-get install -y --no-install-recommends \
     ffmpeg \
- && rm -rf /var/lib/apt/lists/*
+    && rm -rf /var/lib/apt/lists/*
 
 RUN pip install markitdown