Fix the path in the CI file

.gitlab-ci.yml

@@ -9,6 +9,6 @@ before_script:
 build:
   stage: build
   script:
-    - docker build --tag $CI_REGISTRY_IMAGE:fluentd fluentd/fluent-plugin-loki
+    - docker build --tag $CI_REGISTRY_IMAGE:fluentd fluentd/fluent-plugin-grafana-loki
     - docker push $CI_REGISTRY_IMAGE:fluentd