$ git --version
git version 2.20.1 (Apple Git-117)
$ git diff-index --quiet HEAD ; echo $?
1
$ git status > /dev/null
$ git diff-index --quiet HEAD ; echo $?
0

$ git diff-index --quiet HEAD ; echo $?
0
# At this point, `git status` was invoked outside the docker image
$ git --version
git version 2.20.1
$ git diff-index --quiet HEAD ; echo $?
1