[gimp/wip/schumaml/crossraods-optimization] gitlab-ci: variable replacement needs ""

[Michael Schumacher <schumaml src gnome org>]

commit b0af092bc47aed73e6faaaf93c9667df4d250591
Author: Michael Schumacher <schumaml gmx de>
Date:   Mon Dec 7 21:26:13 2020 +0100

    gitlab-ci: variable replacement needs ""

 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 0948389ce0..831f1e1874 100644
--- a/build/docker/CI/Dockerfile.win64
+++ b/build/docker/CI/Dockerfile.win64
@@ -33,7 +33,7 @@ RUN echo 'export XDG_DATA_HOME=$XDG_DATA_HOME && \
 
 # loaders.cache cleanup
 # remove the absolute part of the paths
-RUN sed -i 's&${XDG_DATA_HOME}/crossroad/roads/w64/gimp/&&' \
+RUN sed -i "s&${XDG_DATA_HOME}/crossroad/roads/w64/gimp/&&" \
     ${XDG_DATA_HOME}/crossroad/roads/w64/gimp/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache
 
 # replace / by \ in lines which match '.dll"'