[gimp/wip/schumaml/tune-prepare-stage] build: try to make CI image prepare use the same XDG_CACHE HOME and XDG_DATA_HOME folder structure a

[Michael Schumacher <schumaml src gnome org>]

commit 5f462e33f1ef2c566c967ccfded9923bb7381376
Author: Michael Schumacher <schumaml gmx de>
Date:   Sun May 31 08:20:18 2020 +0200

    build: try to make CI image prepare use the same XDG_CACHE HOME and XDG_DATA_HOME folder structure as 
subsequent steps

 .gitlab-ci.yml | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 875617628d..aeb1bb2e46 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -52,6 +52,9 @@ build-image:
     - echo "RUN apt-get install -y --no-install-recommends \\" >> Dockerfile
     - echo "build-essential cpio g++-mingw-w64-x86-64 gcc-mingw-w64-x86-64 git intltool libgdk-pixbuf2.0-dev 
libglib2.0-bin meson pkg-config python3 python3-distutils python3-docutils python3-pip rpm xsltproc" >> 
Dockerfile
     - echo "RUN pip3 install zstandard" >> Dockerfile
+
+    - echo "RUN export XDG_CACHE_HOME=" $CI_PROJECT_DIR "/.cache/" >> Dockerfile
+    - echo "RUN export XDG_DATA_HOME=" $CI_PROJECT_DIR "/.local/share/" >> Dockerfile
     - echo "RUN git clone --depth=${GIT_DEPTH} git://git.tuxfamily.org/gitroot/crossroad/crossroad.git" >> 
Dockerfile
     - echo "RUN cd crossroad && ./setup.py install --prefix=/usr/local" >> Dockerfile