Improve gitlab-ci script

.gitlab-ci.yml

@@ -9,6 +9,7 @@ before_script: &before
 #------------------------------
 dune:2.10 gcc-10 C++20:
   image: registry.dune-project.org/docker/ci/dune:2.10-debian-11-gcc-10-20
+  tags: [duneci]
   variables:
     DUNECI_BRANCH: releases/2.10
   before_script:
@@ -17,6 +18,7 @@ dune:2.10 gcc-10 C++20:
 
 dune:2.10 clang-11 C++20:
   image: registry.dune-project.org/docker/ci/dune:2.10-debian-11-clang-11-20
+  tags: [duneci]
   variables:
     DUNECI_BRANCH: releases/2.10
   before_script:
@@ -28,12 +30,14 @@ dune:2.10 clang-11 C++20:
 #-------------------------------------------------
 dune:git gcc-12 C++20:
   image: registry.dune-project.org/docker/ci/dune:git-debian-12-gcc-12-20
+  tags: [duneci]
   before_script:
   - *before
   script: duneci-standard-test
 
 dune:git clang-13 C++20:
   image: registry.dune-project.org/docker/ci/dune:git-debian-11-clang-13-20
+  tags: [duneci]
   before_script:
   - *before
   script: duneci-standard-test
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