./ci/before_script.sh: Permission denied

After following your instructions and setting up my Gitlab CI with the content of Unity_v2018.x.ulf as Gitlab CI Environment Variable UNITY_LICENSE_CONTENT, i get the following error in the Job log. Do you have an idea what went wrong?

Running with gitlab-runner 11.4.0-rc1 (1ff344e1)
  on docker-auto-scale 0277ea0f
Using Docker executor with image gableroux/unity3d:2018.2.7f1 ...
Pulling docker image gableroux/unity3d:2018.2.7f1 ...
Using docker image sha256:3fb88895cc5b3582ff2a998b559f4d8877fe5210ba0e38a78de094ada6e736a2 for gableroux/unity3d:2018.2.7f1 ...
Running on runner-0277ea0f-project-5862205-concurrent-0 via runner-0277ea0f-srm-1540026681-eecba82f...
Cloning repository...
Cloning into '/builds/Weasy/StarWars-GalaxyMap'...
Checking out 837f5d3e as config_ci...
Skipping Git submodules setup
$ ./ci/before_script.sh
/bin/bash: line 72: ./ci/before_script.sh: Permission denied
ERROR: Job failed: exit code 1