message: Fix conditional in dockerfile
diff: @@ -33,11 +33,11 @@ RUN set -eux; \
  RUN "$NSS_DIR"/build.sh --static -Ddisable_tests=1 -o
  -# Copy the .git directory from the local clone so that it is possible to do
  -# local updates to the docker image.
  +# Copy the .git directory from the local clone so that it is possible to create
  +# an image that includes local updates.
  RUN mkdir -p /tmp/neqo-reference
  ADD . /tmp/neqo-reference
  -RUN if [[ -d /tmp/neqo-reference/.git ]]; then \
  +RUN if [ -d /tmp/neqo-reference/.git ]; then \
  source=/tmp/neqo-reference; \
  else \
  source=https://github.com/mozilla/neqo; \
  