Fix docker image name

.gitlab-ci.yml

@@ -24,7 +24,7 @@ build_hello:
   script: "echo" # unused but this line is required by GitLab CI
   variables:
     CONTEXT_DIR: hello
-    TO: $CI_REGISTRY_IMAGE/say_hello:$CI_COMMIT_REF_NAME
+    TO: $CI_REGISTRY_IMAGE/hello:$CI_COMMIT_REF_NAME
 
 
 .nomad_deps_template: &nomad_deps