docker: OpenSBI build job depends on OpenSBI container

Add missing dependency build-opensbi -> docker-opensbi.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210303130646.1494015-4-philmd@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

.gitlab-ci.d/opensbi.yml

@@ -25,6 +25,7 @@ docker-opensbi:
 
 build-opensbi:
  stage: build
+ needs: ['docker-opensbi']
  rules: # Only run this job when ...
  - changes: # ... roms/opensbi/ is modified (submodule updated)
    - roms/opensbi/*