Install dune-vtk into the CI-environment as dune-fufem now depends on it

.gitlab-ci.yml

@@ -5,6 +5,7 @@ variables:
 before_script: &before
   - duneci-install-module https://gitlab.dune-project.org/fufem/dune-matrix-vector.git
   - duneci-install-module https://git.imp.fu-berlin.de/agnumpde/dune-solvers.git
+  - duneci-install-module https://gitlab.dune-project.org/extensions/dune-vtk.git
   - duneci-install-module https://gitlab.dune-project.org/fufem/dune-fufem.git
   - duneci-install-module https://gitlab.mn.tu-dresden.de/ag-sander/dune/dune-elasticity.git
   - duneci-install-module https://gitlab.mn.tu-dresden.de/iwr/dune-gmsh4
@@ -29,23 +30,21 @@ dune:git clang-11 C++20:
   - *before
   script: duneci-standard-test
 
-dune:git dune-parmg dune-vtk dune-curvedgeometry dune-curvedgrid dune-foamgrid gcc-10 C++20:
+dune:git dune-parmg dune-curvedgeometry dune-curvedgrid dune-foamgrid gcc-10 C++20:
   image: registry.dune-project.org/docker/ci/dune:git-debian-11-gcc-10-20
   before_script:
   - *before
   - duneci-install-module https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.mn.tu-dresden.de/paraphase/dune-parmg.git
-  - duneci-install-module https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.mn.tu-dresden.de/spraetor/dune-vtk.git
   - duneci-install-module https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.mn.tu-dresden.de/spraetor/dune-curvedgeometry.git
   - duneci-install-module https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.mn.tu-dresden.de/iwr/dune-curvedgrid.git
   - duneci-install-module https://gitlab.dune-project.org/extensions/dune-foamgrid.git
   script: duneci-standard-test
 
-dune:git dune-parmg dune-vtk dune-curvedgeometry dune-curvedgrid dune-foamgrid clang-11 C++20:
+dune:git dune-parmg dune-curvedgeometry dune-curvedgrid dune-foamgrid clang-11 C++20:
   image: registry.dune-project.org/docker/ci/dune:git-debian-11-clang-11-20
   before_script:
   - *before
   - duneci-install-module https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.mn.tu-dresden.de/paraphase/dune-parmg.git
-  - duneci-install-module https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.mn.tu-dresden.de/spraetor/dune-vtk.git
   - duneci-install-module https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.mn.tu-dresden.de/spraetor/dune-curvedgeometry.git
   - duneci-install-module https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.mn.tu-dresden.de/iwr/dune-curvedgrid.git
   - duneci-install-module https://gitlab.dune-project.org/extensions/dune-foamgrid.git