gitlab artifacts must be in fetched directory tree

.gitlab-ci.yml

@@ -2,15 +2,14 @@ build_srpm:
   image: gitlab-registry.cern.ch/linuxsupport/cc7-base
   script:
     - yum install -y gcc-c++ cmake make rpm-build
-    - cd ..
-    - mkdir CTA_build
-    - cd CTA_build
-    - cmake -DPackageOnly:Bool=true ../CTA
+    - mkdir build
+    - cd build
+    - cmake -DPackageOnly:Bool=true ..
     - make cta_srpm
 
   artifacts:
     paths:
-    - ../CTA_build/RPM/SRPMS/cta-0-0.src.rpm
+    - build/RPM/SRPMS/
 
   tags:
     - docker