Push image after build success (#4)

.travis.yml

@@ -20,6 +20,9 @@ script:
     - docker-compose --file docker-compose.yaml --file docker-compose.test.yaml run app vendor/bin/phpcs -p
     - docker-compose --file docker-compose.yaml --file docker-compose.test.yaml run -e APP_ENV=dev app sh -c "bin/console cache:warmup --no-optional-warmers && vendor/bin/phpstan analyse"
 
+after_success:
+    - .scripts/travis/push-image.sh content-store
+
 if: |
     branch = master OR \
     branch =~ /^(?:[0-9]|[1-9][0-9]*)\.(?:[0-9]|[1-9][0-9]*)$/ OR \