Add new tests to pipeline

.gitlab-ci.yml

@@ -30,6 +30,7 @@ test cardmech 1/2:
     - ./test/cellmodels/TestElphyModels
     - ./test/cellmodels/TestSolvers
     - ./test/cellmodels/TestTenTusscher
+    - ./test/cellmodels/TestTensionModel
     - ./test/elasticity/TestMaterial
     - ./test/elasticity/TestAssembleConsistency
     - ./test/elasticity/TestLinearBeamProblem