try to fix pipeline

.gitlab-ci.yml

@@ -36,5 +36,5 @@ build-container:
     - cp deployment/nginx.conf web-build
     - cd web-build
     - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
-    - /kaniko/executor --cache=true --context ${CI_PROJECT_DIR}/web-build --destination ${CI_REGISTRY_IMAGE}/${KANIKO_BUILD_IMAGENAME}:${CI_COMMIT_REF_NAME}
+    - /kaniko/executor --cache=true --context ${CI_PROJECT_DIR}/web-build --destination ${CI_REGISTRY_IMAGE}/${KANIKO_BUILD_IMAGENAME}:${CI_COMMIT_REF_SLUG}