[gnome-control-center] CI: avoid rebuilding in the test job

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 316b901296e781f13ab85607117d1f83e1e0f999
Author: Claudio André <claudioandre br gmail com>
Date:   Thu Jun 21 11:03:57 2018 -0300

    CI: avoid rebuilding in the test job
    
    The test job was recompiling the software (unexpected behavior).
    This was happening because the git checkout runs after the artifacts
    download (resulting in the source code being newer than the object
    files).
    
    This commits saves and reuses the working directory produced by the
    build job.

 .gitlab-ci.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4e89a0c6a..00452b2a8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,7 +15,7 @@ stages:
 .Git Untracked files: &save_untracked_files
   artifacts:
     name: untracked
-    untracked: true
+    paths: [$(pwd)]
     expire_in: 3h30min
 
 .Show Info: &environment_information
@@ -47,6 +47,9 @@ build:
     - echo "== Report =="
     - build-aux/ci/ci-helper.sh "WARNINGS"
 
+    # Save all but git-related files
+    - rm -rf .git .gitignore .gitmodules
+
 ##
 # Stage: Test
 #