add "deploy to packagist" stage during ci

.gitlab-ci.yml

@@ -1,6 +1,6 @@
+.test_definition: &test_definition
    services:
        - chill/database:latest
- 
    before_script: 
        - composer config github-oauth.github.com $GITHUB_TOKEN
        - composer install --no-interaction 
@@ -11,8 +11,18 @@ before_script:
 
 test:php-5.6:
    stage: test
+   image: chill/ci-image:php-5.6
+   <<: *test_definition
    script: phpunit 
 test:php-7:
    image: chill/ci-image:php-7
    stage: test
+   <<: *test_definition
    script: phpunit
+   
+deploy-packagist:
+   stage: deploy
+   image: chill/ci-image:php-7
+   before_script: ~
+   script:
+       - curl -XPOST -H'content-type:application/json' "https://packagist.org/api/update-package?username=$PACKAGIST_USERNAME&apiToken=$PACKAGIST_TOKEN" -d"{\"repository\":{\"url\":\"$CI_PROJECT_PATH.git\"}}"