ALso build nginx docker image in CI.

.gitlab-ci.yml

@@ -6,3 +6,4 @@ build:
   script:
     - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" >/kaniko/.docker/config.json
     - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+    - /kaniko/executor --context $CI_PROJECT_DIR/docker/nginx --dockerfile $CI_PROJECT_DIR/docker/nginx/Dockerfile --destination $CI_REGISTRY_IMAGE/nginx:$CI_COMMIT_REF_NAME