upgrade gitlab-ci to run test only on php 7.2

.gitlab-ci.yml

@@ -17,11 +17,6 @@ stages:
    - deploy-doc
  
     
-test:php-7:
-    stage: test
-    <<: *test_definition
-    image: chill/ci-image:php-7
-    script: vendor/bin/phpunit
 
 test:php-7.1:
     stage: test
@@ -29,11 +24,17 @@ test:php-7.1:
     image: chill/ci-image:php-7.1
     script: vendor/bin/phpunit
 
+test:php-7.2:
+    stage: test
+    <<: *test_definition
+    image: chill/ci-image:php-7.2
+    script: vendor/bin/phpunit
+
 # deploy documentation
 api-doc-build:
    stage: build-doc
    environment: api-doc
-   image: chill/ci-image:php-7
+   image: chill/ci-image:php-7.2
    before_script:
       - mkdir api-doc
    script: apigen generate --destination api-doc/$CI_BUILD_REF_NAME/$CI_PROJECT_NAME
@@ -62,7 +63,7 @@ api-doc-deploy:
       
 deploy-packagist:    
     stage: deploy    
-    image: chill/ci-image:php-7    
+    image: chill/ci-image:php-7.2    
     before_script:        
         # test that PACKAGIST USERNAME and PACKAGIST_TOKEN variable are set        
         - if [ -z ${PACKAGIST_USERNAME+x} ]; then echo "Please set PACKAGIST_USERNAME variable"; exit -1;  fi