Implement the first job in a job matrix

Store variables and job template separatly and put them together for the job.
With only one job this doesn't make sense yet but if more jobs are added the
definition of the new jobs become much more easy and the duplicated code is
removed.

.gitlab-ci.yml

@@ -255,23 +255,11 @@ CbmRoot_Merge_Singularity:
     - cat Dart.cfg
     - $PWD/Dart.sh MergeRequest Dart.cfg
 
-CbmRoot_Merge_realData:
-  stage: build
-  tags:
-    - CbmRoot_realData
-  only:
-    refs:
-      - merge_requests
-    variables:
-      - $CI_MERGE_REQUEST_PROJECT_PATH == "computing/cbmroot" && $CI_MERGE_REQUEST_TARGET_BRANCH_NAME == "master"
-  variables:
-    OS: Debian10
-    FAIRSOFT_VERSION: jun19p2_root6
-    FAIRROOT_VERSION: v18.2.1
-    EXTRA_PATH: /opt/cmake/3.20.1/bin
-    NCPU: 16
-    BASE_PATH: "/opt/cbmsoft/"
-    RAW_DATA_PATH: "/opt/cbmsoft/beamtime-test-data/reduced/"
+
+#
+# job template
+#
+.build_and_test: &build_and_test
   before_script:
     - echo $CI_MERGE_REQUEST_SOURCE_PROJECT_PATH
     - echo $CI_MERGE_REQUEST_PROJECT_PATH
@@ -289,18 +277,51 @@ CbmRoot_Merge_realData:
     - echo "export SIMPATH=$BASE_PATH/fairsoft_$FAIRSOFT_VERSION/installation" >> Dart.cfg
     - echo "export FAIRROOTPATH=$BASE_PATH/fairroot_$FAIRROOT_VERSION-fairsoft_$FAIRSOFT_VERSION" >> Dart.cfg
     - if [[ -n $RAW_DATA_PATH ]]; then
-    - echo "export RAW_DATA_PATH=$RAW_DATA_PATH" >> Dart.cfg
+    -   echo "export RAW_DATA_PATH=$RAW_DATA_PATH" >> Dart.cfg
     - fi
     - echo "export BUILDDIR=$PWD/build" >> Dart.cfg
     - echo "export SOURCEDIR=$PWD" >> Dart.cfg
     - echo "export NCPU=$NCPU" >> Dart.cfg
-    - echo "export PATH=$EXTRA_PATH:$PATH" >> Dart.cfg
+    - if [[ -n $EXTRA_PATH ]]; then
+    -   echo "export PATH=$EXTRA_PATH:$PATH" >> Dart.cfg
+    - fi
     - cat Dart.cfg
     - $PWD/Dart.sh MergeRequest Dart.cfg
   after_script:
     - ls
     - pwd
     - cat Dart.cfg
+    - rm -rf build
+
+#
+# job element definitions
+#
+.realData_tag: &realData_tag
+  stage: build
+  tags:
+    - CbmRoot_realData
+  variables:
+    OS: Debian10
+    FAIRSOFT_VERSION: jun19p2_root6
+    FAIRROOT_VERSION: v18.2.1
+    EXTRA_PATH: /opt/cmake/3.20.1/bin
+    NCPU: 16
+    BASE_PATH: "/opt/cbmsoft/"
+    RAW_DATA_PATH: "/opt/cbmsoft/beamtime-test-data/reduced/"
+
+.on_merge_request: &on_merge_request
+  only:
+    refs:
+      - merge_requests
+    variables:
+      - $CI_MERGE_REQUEST_PROJECT_PATH == "computing/cbmroot" && $CI_MERGE_REQUEST_TARGET_BRANCH_NAME == "master"
+
+#
+# job matrix
+#
+CbmRoot_Merge_realData:
+  <<: [*realData_tag, *on_merge_request, *build_and_test]
+
 
 InformCodeOwners:
   stage: finalise