fix syntax error CI/CD

.gitlab-ci.yml

@@ -219,7 +219,7 @@ container:build:
       variables:
         CACHE_OPTION: --no-cache
     - if: $CI_PIPELINE_SOURCE == "push" 
-          && $CI_COMMIT_BRANCH == "$CI_DEFAULT_BRANCH"
+          && $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
       variables:
         CACHE_OPTION: --cache-from "${CI_REGISTRY_IMAGE}/${CONTAINER_DEPLOY_IMAGE}:latest"
     - if: $CI_PIPELINE_SOURCE == "push" && $CI_COMMIT_BRANCH