fix: remove slow system git build dependency

Dockerfile

@@ -5,10 +5,6 @@ ENV PYTHONPATH=/app/modelhub_submmit_api
 
 WORKDIR /app
 
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends ca-certificates git \
-    && rm -rf /var/lib/apt/lists/*
-
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt