Update the Jenkinsfile to publish containers when running in trusted.ci

See also <https://github.com/jenkins-infra/pipeline-library>

Fixes INFRA-729
diff --git a/Jenkinsfile b/Jenkinsfile
index 7f4f4bb..3170bf9 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -18,4 +18,10 @@
         bats/bin/bats tests
         """
     }
+
+    if (infra.isTrusted()) {
+        stage('Publish') {
+            sh './weekly.sh'
+        }
+    }
 }