install curl for update hooks

.gitlab-ci.yml

@@ -39,6 +39,7 @@ deploy:
   - tags
   - triggers
   script:
+  - apk --no-cache --quiet add curl
   - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
   - docker pull $MY_BUILT_IMAGE
   - docker login -u "$DOCKER_USER" -p "$DOCKER_PASS"