Use keyword extends in gitlab-ci

.gitlab-ci.yml

@@ -19,10 +19,9 @@ variables:
   DUNE_LOG_LEVEL:     DEBUG
 
 debian:10 gcc-7-17--expensive:
+  extends: .common
   # This image has Vc
   image: registry.dune-project.org/docker/ci/debian:10
-  script: duneci-standard-test
-  stage: test
   # allow expensive tests
   variables:
     DUNECI_CXXFLAGS: -mavx
@@ -35,23 +34,19 @@ debian:10 gcc-7-17--expensive:
   # is unavailable
   allow_failure: true
 
-
 debian-11-gcc-9-17-nopython:
+  extends: .common
   image: registry.dune-project.org/docker/ci/debian:11
-  script: duneci-standard-test
-  stage: test
   variables:
     DUNECI_TOOLCHAIN:  gcc-9-17
     DUNECI_CMAKE_FLAGS: '-DCMAKE_DISABLE_FIND_PACKAGE_Python3=TRUE'
-  tags: [duneci]
+
 ubuntu-20.04-clang-10-20-nobindings:
+  extends: .common
   image: registry.dune-project.org/docker/ci/ubuntu:20.04
-  script: duneci-standard-test
-  stage: test
   variables:
     DUNECI_TOOLCHAIN: clang-10-20
     DUNECI_CMAKE_FLAGS: '-DDUNE_ENABLE_PYTHONBINDINGS=OFF'
-  tags: [duneci]
 
 system-test:
   stage: downstream