docker: EDK2 build job depends on EDK2 container

Add missing dependency build-edk2 -> docker-edk2.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210303130646.1494015-3-philmd@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

.gitlab-ci.d/edk2.yml

@@ -25,6 +25,7 @@ docker-edk2:
 
 build-edk2:
  stage: build
+ needs: ['docker-edk2']
  rules: # Only run this job when ...
  - changes: # ... roms/edk2/ is modified (submodule updated)
    - roms/edk2/*