fix (and run a gitlab-runner hopefully)

1 job for feature/sphinx_doc in 2 minutes and 47 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Deploy
failed #582387
pages

00:02:47

 
Name Stage Failure
failed
pages Deploy
  /usr/local/envs/dtk-doc/share/cmake-3.14/Modules/ExternalProject.cmake:3211 (_ep_add_download_command)
cmake/git_clone.cmake:8 (ExternalProject_Add)
CMakeLists.txt:46 (git_clone)


-- Configuring incomplete, errors occurred!
See also "/builds/2c2bf15f/0/dtk/dtk-doc/build/CMakeFiles/CMakeOutput.log".
See also "/builds/2c2bf15f/0/dtk/dtk-doc/build/CMakeFiles/CMakeError.log".
ERROR: Job failed: exit code 1