add retool

.gitlab-ci.yml

@@ -19,6 +19,7 @@ autoupdate:
   script:
   - wget "https://github.com/${UPSTREAM_GITHUB_PATH}/archive/refs/tags/${UPSTREAM_VERSION}.tar.gz"
   - tar -xf "${UPSTREAM_VERSION}.tar.gz"
+  - go get github.com/twitchtv/retool
   - cd hcloud_exporter-*
   - make generate build
   - mv bin/hcloud_exporter ../