Fix cache folder

.gitlab-ci.yml

@@ -2,7 +2,7 @@ before_script:
   - module load python/3.6.4-anaconda
   - pip install --user attrs==20.3.0 pytest==6.2.2 pytest-pythonpath==0.7.3 pytest-cov==2.11.1
   - module load singularity/3.5.3
-  - export SINGULARITY_CACHEDIR=${dir}/cache
+  - export SINGULARITY_CACHEDIR=${dir}cache/
   - module load nextflow/20.01.0
   - ln -sfn /project/BICF/BICF_Core/shared/gudmap/test_data/* ./test_data/
   - mkdir -p ~/.deriva