Adjust license and CI workflow

.gitlab-ci.yml

 Deploy:
   script:
     - curl -XPOST -H'content-type:application/json' "https://packagist.org/api/update-package?username=${PACKAGIST_USERNAME}&apiToken=${PACKAGIST_API_TOKEN}" -d'{"repository":{"url":"'${CI_PROJECT_URL}'"}}'
+  only:
+    - tags
+    - triggers
+    - schedules

composer.json

@@ -4,7 +4,7 @@
     "type": "library",
     "keywords": ["Drupal", "Development", "Docker"],
     "homepage": "https://gitlab.lakedrops.com/composer/library/docker-traefik",
-    "license": "GPL-2.0+",
+    "license": "GPL-2.0-or-later",
     "authors": [
         {
             "name": "Jürgen Haas",