build: add docker image test

.gitlab-ci.yml

@@ -31,6 +31,15 @@ include:
    inputs:
      stage: test
      app_root: "app"
+ - component: $CI_SERVER_FQDN/ub-unibas/ci/docker-components/publish-image@main
+   inputs:
+     stage: test
+
+publish-image:
+  extends: .publish-image
+  variables:
+    IMAGE_TAG: hello-world:latest
+  needs: ["build"]
 
 check-description:
   stage: test
@@ -57,7 +66,7 @@ check-default-component:
   stage: test
   image: busybox
   script:
-    - ls templates/*-default.yml || (echo "Please add a default component named <repo>-default.yml, e.g gradle-default.yml" && exit 1)
+    - ls templates/*-default.yml || (echo "Please add a default component templates/gradle-default.yml" && exit 1)
 
 check-job-names:
   stage: test