[gimp/wip/schumaml/crossraods-optimization] gitlab-ci: use depth=1

[Michael Schumacher <schumaml src gnome org>]

commit e636c2dc44f71b23e8562be4f14c49efda7c2e0f
Author: Michael Schumacher <schumaml gmx de>
Date:   Sun Dec 6 01:32:39 2020 +0100

    gitlab-ci: use depth=1

 build/docker/CI/Dockerfile.win64 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/build/docker/CI/Dockerfile.win64 b/build/docker/CI/Dockerfile.win64
index b0b7589a5e..d71a7871b0 100644
--- a/build/docker/CI/Dockerfile.win64
+++ b/build/docker/CI/Dockerfile.win64
@@ -9,7 +9,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 # install crossroad
 RUN pip3 install zstandard
-RUN git clone --depth=${GIT_DEPTH} git://git.tuxfamily.org/gitroot/crossroad/crossroad.git
+RUN git clone --depth=1 git://git.tuxfamily.org/gitroot/crossroad/crossroad.git
 RUN cd crossroad && ./setup.py install --prefix=/usr/local && cd ..
 
 # install babl and GEGL dependencies with crossroad