gitlab-ci: Fix 'when:' condition in acceptance_test_job_template

Jobs depending on another should not use the 'when: always'
condition, because if a dependency failed we should not keep
running jobs depending on it. The correct condition is
'when: on_success'.

Fixes: f56bf4ca ("gitlab: Run Avocado tests manually (except mainstream CI)")
Reported-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20210727142431.1672530-3-philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

.gitlab-ci.d/buildtest-template.yml

@@ -73,9 +73,9 @@
     # in its namespace setting or via git-push option, see documentation
     # in /.gitlab-ci.yml of this repository).
     - if: '$CI_PROJECT_NAMESPACE == "qemu-project"'
-      when: always
+      when: on_success
     - if: '$QEMU_CI_AVOCADO_TESTING'
-      when: always
+      when: on_success
     # Otherwise, set to manual (the jobs are created but not run).
     - when: manual
       allow_failure: true