Fix (coscine/issues#2906)

.gitlab-ci.yml

@@ -2,6 +2,7 @@ include:
   - project: coscine/tools/gitlab-ci-templates
     file: 
       - /dotnet.yml
+      - /container.yml
 
 stages:
   - build
@@ -24,4 +25,4 @@ publish:
   extends: .publish-artifact-release
 
 publish-container:
-  extends: .container-registry-gitlab
+  extends: .publish-container-gitlab