debug docker file

Signed-off-by: tzhouam <tzhouam@connect.ust.hk>

docker/Dockerfile.ci

@@ -7,7 +7,7 @@ WORKDIR ${APP_DIR}
 
 # System deps
 RUN apt-get update && \
-    apt-get install -y ffmpeg && \
+    apt-get install -y ffmpeg git && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*