Add git repository clones

First attempt at seeding the data directory with existing notebooks.
Looking into at what it would take to enable `git-sync` on filesystem changes, to keep a copy of changes without having to always export.

Dockerfile

@@ -1,7 +1,9 @@
 FROM livebook/livebook:latest-cuda11.8
 
 # apt-get required packages
-RUN apt-get update -yqq && apt-get install -yqq ffmpeg
+RUN apt-get update -yqq && apt-get install -yqq git ffmpeg
+
+RUN git clone https://github.com/simonthum/git-sync.git /home/livebook/git-sync
 
 ENV LIVEBOOK_APP_SERVICE_NAME "🐳 Hugging Face - $SPACE_TITLE"
 ENV LIVEBOOK_APP_SERVICE_URL "https://huggingface.co/spaces/$SPACE_AUTHOR_NAME/$SPACE_REPO_NAME"
@@ -13,5 +15,8 @@ ENV LIVEBOOK_PORT 7860
 EXPOSE 7860
 
 USER root
-RUN mkdir -p /data
+RUN mkdir -p /data/notebooks
 RUN chmod 777 /data
+RUN chmod 777 /data/notebooks
+
+RUN git clone https://github.com/w0rd-driven/livebook_notebooks /data/notebooks