[ci] always run test selection stage

the ci seems to sometimes fail to pass the created .yml file to the
subsequent stage. Thus, we now always run the test-selection stage but
skip script execution in case we are not in a merge request

.gitlab-ci.yml

 stages:
-  - configure
   - trigger
   - downstream modules
 
@@ -15,39 +14,8 @@ workflow:
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
     - if: $CI_PIPELINE_SOURCE == "merge_request_event"
 
-
-################################################################################
-# Stage 1: configure the test pipeline.                                        #
-# This creates the .yml to be used for the test pipeline trigger stage. Within #
-# merge request, we create a .yml file that adds a test selection stage before #
-# the build stage to identify the tests affected by changes introduced in the  #
-# merge request. In all other cases, we use the default which runs all tests.  #
-################################################################################
-select-pipeline:
-  image: $IMAGE_REGISTRY_URL/full:dune-2.7-gcc-ubuntu-20.04
-  stage: configure
-  script:
-    - |
-      if [ $CI_PIPELINE_SOURCE == "merge_request_event" ]; then
-          cp .gitlab-ci/affectedtestsonly.yml pipeline-config.yml
-      else
-          cp .gitlab-ci/default.yml pipeline-config.yml
-      fi
-  artifacts:
-    paths:
-      - pipeline-config.yml
-    expire_in: 3 hours
-  rules:
-    - if: $CI_PIPELINE_SOURCE == "schedule"
-      when: always
-    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
-      when: manual
-    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
-      when: manual
-
-
 ###################################################################################
-# Stage 2: trigger the Dumux test pipelines                                       #
+# Stage 1: trigger the Dumux test pipelines                                       #
 # In this stage, we trigger the test pipeline with different configurations, i.e. #
 # different Dune versions, compilers, etc. Within merge requests, we create three #
 # test pipelines including two different compilers and a full and minimal setup   #
@@ -57,13 +25,18 @@ select-pipeline:
 # basic trigger job to start the test pipeline
 .base-trigger:
   stage: trigger
-  needs:
-    - select-pipeline
   trigger:
-    include:
-      - artifact: pipeline-config.yml
-        job: select-pipeline
+    include: .gitlab-ci/default.yml
     strategy: depend
+  variables:
+    TRIGGER_SOURCE: $CI_PIPELINE_SOURCE
+  rules:
+  - if: $CI_PIPELINE_SOURCE == "schedule"
+    when: always
+  - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+    when: manual
+  - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+    when: manual
 
 # trigger for jobs that should not be created in merge requests
 .non-mr-trigger:
@@ -102,7 +75,7 @@ full-dune-master-clang:
 
 
 #########################################################
-# Stage 3: trigger test pipelines of downstream modules #
+# Stage 2: trigger test pipelines of downstream modules #
 #########################################################
 
 # trigger lecture test

.gitlab-ci/affectedtestsonly.yml

-default:
-  image: $IMAGE
-
-stages:
-  - configure
-  - build
-  - test
-
-workflow:
-  rules:
-    - if: $CI_PIPELINE_SOURCE=="parent_pipeline"
-
-select tests:
-  stage: configure
-  image: $IMAGE_REGISTRY_URL/full:dune-2.7-gcc-ubuntu-20.04
-  script:
-    - dunecontrol --opts=$DUNE_OPTS_FILE --current all
-    - |
-      pushd build-cmake
-        python3 ../bin/testing/findtests.py -f ../affectedtests.json -t origin/master
-      popd
-  artifacts:
-    paths:
-      - affectedtests.json
-    expire_in: 3 hours
-
-build dumux:
-  stage: build
-  script:
-    - dunecontrol --opts=$DUNE_OPTS_FILE --current all
-    - |
-      pushd build-cmake
-        make clean
-        python3 ../bin/testing/runselectedtests.py -c ../affectedtests.json -b
-      popd
-  artifacts:
-    paths:
-      - build-cmake
-      - affectedtests.json
-    expire_in: 3 hours
-  needs:
-    - job: select tests
-      artifacts: true
-
-test dumux:
-  stage: test
-  script:
-    - |
-      pushd build-cmake
-        python3 ../bin/testing/runselectedtests.py -c ../affectedtests.json -t
-      popd
-  needs:
-    - job: build dumux
-      artifacts: true
-  artifacts:
-    reports:
-      junit: junit/dumux-cmake.xml

.gitlab-ci/default.yml

@@ -2,6 +2,7 @@ default:
   image: $IMAGE
 
 stages:
+  - configure
   - build
   - test
 
@@ -9,20 +10,60 @@ workflow:
   rules:
     - if: $CI_PIPELINE_SOURCE=="parent_pipeline"
 
+variables:
+  TRIGGER_SOURCE: "unknown"
+
+select tests:
+  stage: configure
+  image: $IMAGE_REGISTRY_URL/full:dune-2.7-gcc-ubuntu-20.04
+  script:
+    - |
+      if [[ "$TRIGGER_SOURCE" == "merge_request_event" ]]; then
+          dunecontrol --opts=$DUNE_OPTS_FILE --current all
+          pushd build-cmake
+            python3 ../bin/testing/findtests.py -f ../affectedtests.json -t origin/master
+          popd
+      else
+          echo "Skipping test selection, build/test stages will consider all tests!"
+          echo "{}" >> ../affectedtests.json
+      fi
+  artifacts:
+    paths:
+      - affectedtests.json
+    expire_in: 3 hours
+
 build dumux:
   stage: build
   script:
     - dunecontrol --opts=$DUNE_OPTS_FILE --current all
-    - dunecontrol --opts=$DUNE_OPTS_FILE --current bexec make -k -j4 build_tests
+    - |
+      pushd build-cmake
+        if [[ "$TRIGGER_SOURCE" == "merge_request_event" ]]; then
+          python3 ../bin/testing/runselectedtests.py -c ../affectedtests.json -b
+        else
+          python3 ../bin/testing/runselectedtests.py --all -b
+        fi
+      popd
   artifacts:
     paths:
       - build-cmake
+      - affectedtests.json
     expire_in: 3 hours
+  needs:
+    - job: select tests
+      artifacts: true
 
 test dumux:
   stage: test
   script:
-    - dunecontrol --opts=$DUNE_OPTS_FILE --current bexec dune-ctest -j4 --output-on-failure
+    - |
+      pushd build-cmake
+        if [[ "$TRIGGER_SOURCE" == "merge_request_event" ]]; then
+          python3 ../bin/testing/runselectedtests.py -c ../affectedtests.json -t
+        else
+          python3 ../bin/testing/runselectedtests.py --all -t
+        fi
+      popd
   needs:
     - job: build dumux
       artifacts: true