Fixing problem in gitlab-ci configuration

After merging MR14 the pipelines for mac failed. After investigating the logs I learned that the cause for this is the missing writing privileges for the target directory. I guess this has been changed due to move to the new mac systems of Christian Felder.

In libqcr the artifacts are in general disabled for mac, that would be one option to solve this problem. In the BornAgain gitlab-ci script the corresponding destination dir is different though (/tmp/ba/). I think this is the better choice, so I change the path to /tmp/lmfit/ accordingly

@a.nejati so that you can see this later