[ci] update CI to use dedicated docker image and save patch on style failure

.gitlab-ci.yml

 #image: dumux-precice:3.3git-iterative-pr-2.2.0
 #image: dumux-precice:3.3-2.2.1
-image: ub2004-dumux-precice:3.3-2.2.1
+image: ub2004-style-check:clang-10
 
 
 stages:
@@ -8,7 +8,7 @@ stages:
     - build
     - test
 
-check-style:
+check-style-clang-10:
     stage: check
     script:
         - ./scripts/format/run-clang-format.sh
@@ -16,6 +16,7 @@ check-style:
         - if [ -s style-patch.diff ]; then echo "Download the style patch as artifact and apply it or run ./scripts/format/run-clang-format.sh and commit again."; false; fi
     needs: []
     artifacts:
+        when: on_failure
         paths:
             - style-patch.diff
         expire_in: 7 day
@@ -44,6 +45,10 @@ build-iterative-coupling:3.3-2.2.1:
   image: ub2004-dumux-precice:3.3-2.2.1
   <<: *build-iterative-coupling
 
+build-iterative-coupling:3.4-2.2.1:
+  image: ub2004-dumux-precice:3.3-2.2.1
+  <<: *build-iterative-coupling
+
 build-iterative-coupling:master-2.2.1:
   image: dumux-precice:master-2.2.1
   rules:
@@ -74,6 +79,10 @@ build-monolithic-coupling:3.3-2.2.1:
   image: ub2004-dumux-precice:3.3-2.2.1
   <<: *build-monolithic-coupling
 
+build-monolithic-coupling:3.4-2.2.1:
+  image: ub2004-dumux-precice:3.3-2.2.1
+  <<: *build-monolithic-coupling
+
 build-monolithic-coupling:master-2.2.1:
   image: dumux-precice:master-2.2.1
   rules:
@@ -100,6 +109,12 @@ test-iterative-coupling:3.3-2.2.1:
   needs:
     - build-iterative-coupling:3.3-2.2.1
 
+test-iterative-coupling:3.4-2.2.1:
+  image: ub2004-dumux-precice:3.4-2.2.1
+  <<: *test-iterative-coupling
+  needs:
+    - build-iterative-coupling:3.4-2.2.1
+
 .test_template: &test-monolithic-coupling
   stage: test
   script:
@@ -117,6 +132,12 @@ test-monolithic-coupling:3.3-2.2.1:
   needs:
     - build-monolithic-coupling:3.3-2.2.1
 
+test-monolithic-coupling:3.4-2.2.1:
+  image: ub2004-dumux-precice:3.4-2.2.1
+  <<: *test-monolithic-coupling
+  needs:
+    - build-monolithic-coupling:3.4-2.2.1
+
 .build_template: &build-monolithic-flow-over-step-2d
   stage: build
   script:
@@ -141,6 +162,10 @@ build-monolithic-flow-over-step-2d:3.3-2.2.1:
   image: ub2004-dumux-precice:3.3-2.2.1
   <<: *build-monolithic-flow-over-step-2d
 
+build-monolithic-flow-over-step-2d:3.4-2.2.1:
+  image: ub2004-dumux-precice:3.4-2.2.1
+  <<: *build-monolithic-flow-over-step-2d
+
 build-monolithic-flow-over-step-2d:master-2.2.1:
   image: dumux-precice:master-2.2.1
   rules:
@@ -164,6 +189,12 @@ test-monolithic-flow-over-step-2d:3.3-2.2.1:
   needs:
     - build-monolithic-flow-over-step-2d:3.3-2.2.1
 
+test-monolithic-flow-over-step-2d:3.4-2.2.1:
+  image: ub2004-dumux-precice:3.4-2.2.1
+  <<: *test-monolithic-flow-over-step-2d
+  needs:
+    - build-monolithic-flow-over-step-2d:3.4-2.2.1
+
 .build_template: &build-monolithic-ff-pm-3d
   stage: build
   script:
@@ -188,6 +219,10 @@ build-monolithic-ff-pm-3d:3.3-2.2.1:
   image: ub2004-dumux-precice:3.3-2.2.1
   <<: *build-monolithic-ff-pm-3d
 
+build-monolithic-ff-pm-3d:3.4-2.2.1:
+  image: ub2004-dumux-precice:3.4-2.2.1
+  <<: *build-monolithic-ff-pm-3d
+
 build-monolithic-ff-pm-3d:master-2.2.1:
   image: dumux-precice:master-2.2.1
   rules:
@@ -214,3 +249,8 @@ test-monolithic-ff-pm-3d:3.3-2.2.1:
   needs:
     - build-monolithic-ff-pm-3d:3.3-2.2.1
 
+test-monolithic-ff-pm-3d:3.4-2.2.1:
+  image: ub2004-dumux-precice:3.4-2.2.1
+  <<: *test-monolithic-ff-pm-3d
+  needs:
+    - build-monolithic-ff-pm-3d:3.4-2.2.1
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