Add deployment to package registry

.gitlab-ci.yml

@@ -1,6 +1,7 @@
 stages:
   - validate
   - test
+  - deploy
 
 before_script:
   - apk add zip graphicsmagick
@@ -143,3 +144,12 @@ test:phpunit:7.2:
   script:
     - composer install --prefer-dist --no-progress
     - php -d memory_limit=-1 ./vendor/bin/phpunit --testdox
+
+deploy:composer:package:
+  image: alpine:3.15.5
+  stage: deploy
+  script:
+    - apk add curl
+    - 'curl --header "Job-Token: $CI_JOB_TOKEN" --data tag=${CI_COMMIT_TAG} "${CI_API_V4_URL}/projects/$CI_PROJECT_ID/packages/composer"'
+  only:
+    - tags