Save the latest git commit ID inside the Docker containers to /app/.git_commit

docker/Dockerfile.base

@@ -1,6 +1,7 @@
 FROM ubuntu:18.04
 
 ARG DEBUG=true
+ARG GIT_COMMIT=
 
 ENV DEBIAN_FRONTEND=noninteractive
 
@@ -8,6 +9,7 @@ COPY ./docker/install.sh ./server/website/requirements.txt /
 WORKDIR /
 
 RUN mkdir -p /app \
+    && ([ -n "$GIT_COMMIT" ] && echo "base=$GIT_COMMIT" > /app/.git_commit || :) \
     && chmod +x install.sh \
     && ./install.sh base