Merge branch 'master' into 'test-spacktests-workaround'

update CI

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!233

.gitlab-ci.yml

 stages:
   - build
-  - sync
 
 variables:
   SPACK_VERSION: v0.18.1
@@ -206,7 +205,7 @@ build-spack-env-on-runner:
     when: on_failure
 
 sync-gitlab-spack-instance:
-  stage: sync
+  stage: build
   tags:
     - docker-runner
     - read-write