Rename directories in multi-gpu regression tests

When running the regression tests on 4 and 8 GPUs at the same time, one of them fails due to missing files.

ℹ Copying files...
✔  Done
🚀  Launched job 2684546
✔  Wrote job ID 2684546 to file hpcrocket4GPU.log
ℹ Collecting files...
❌ FileNotFoundError: multigpu_test/output/4GPU/
✔  Done
ℹ Cleaning files...
❌ ResourceNotFound: resource '' not found
               ╷          ╷              
  ID           │ Name     │ State        
╶──────────────┼──────────┼─────────────╴
  2684546      │ Regr4GPU │ ❌ FAILED    
  2684546.bat+ │ batch    │ ❌ FAILED    
  2684546.ext+ │ extern   │ ✔ COMPLETED  
               ╵          ╵              

I think the cause is the clean stage in the rocketGPU.yml file.

clean:
  - multigpu_test/*

Since the directory had the same name for both tests, one test may have deleted the data of the other test. Therefore, I renamed the directories.

.gitlab-ci.yml

@@ -316,7 +316,7 @@ regression_test_4gpu:
     - apt-get update && apt-get install -y git-lfs
 
   script:
-    - hpc-rocket launch tests/regression-tests/multigpu_test_4_gpu/rocket4GPU.yml --watch --save-jobid hpcrocket4GPU.log
+    - hpc-rocket launch tests/regression-tests/multigpu_test/rocket4GPU.yml --watch --save-jobid hpcrocket4GPU.log
     - cat output/4GPU/slurm4GPU.out
     - git clone --depth 1 --filter=blob:none --sparse https://git.rz.tu-bs.de/irmb/virtualfluids-reference-data
     - cd virtualfluids-reference-data
@@ -326,7 +326,7 @@ regression_test_4gpu:
     - fieldcompare dir output/4GPU virtualfluids-reference-data/regression_tests/gpu/SphereMultiGPU_4GPU_2Levels --include-files "SphereMultiGPU*.vtu"
 
   after_script:
-    - hpc-rocket cancel tests/regression-tests/multigpu_test_4_gpu/rocket4GPU.yml --read-jobid-from hpcrocket4GPU.log
+    - hpc-rocket cancel tests/regression-tests/multigpu_test/rocket4GPU.yml --read-jobid-from hpcrocket4GPU.log
 
   artifacts:
     when: on_failure
@@ -352,7 +352,7 @@ regression_test_8gpu:
     - apt-get update && apt-get install -y git-lfs
 
   script:
-    - hpc-rocket launch tests/regression-tests/multigpu_test_8_gpu/rocket8GPU.yml --watch --save-jobid hpcrocket8GPU.log
+    - hpc-rocket launch tests/regression-tests/multigpu_test/rocket8GPU.yml --watch --save-jobid hpcrocket8GPU.log
     - cat output/8GPU/slurm8GPU.out
     - git clone --depth 1 --filter=blob:none --sparse https://git.rz.tu-bs.de/irmb/virtualfluids-reference-data
     - cd virtualfluids-reference-data
@@ -362,7 +362,7 @@ regression_test_8gpu:
     - fieldcompare dir output/8GPU virtualfluids-reference-data/regression_tests/gpu/SphereMultiGPU_8GPU_2Levels --include-files "SphereMultiGPU*.vtu"
   
   after_script:
-    - hpc-rocket cancel tests/regression-tests/multigpu_test_8_gpu/rocket8GPU.yml --read-jobid-from hpcrocket8GPU.log
+    - hpc-rocket cancel tests/regression-tests/multigpu_test/rocket8GPU.yml --read-jobid-from hpcrocket8GPU.log
 
   artifacts:
     when: on_failure