Fix: add COMPOSER_MEMORY_LIMIT env variable to fix Memory Issues in T…

[imagina]

…ravis CI.

[nWidart]

Thank you very nice!
I'm surprised it only works on PHP 7.1 🤔

[mikemand]

It's working for the other PHP versions too, but it looks like Travis had database issues:

1. Modules\Menu\Tests\EloquentMenuItemRepositoryTest::it_should_create_menu_item_as_root
   Illuminate\Database\QueryException: SQLSTATE[HY000]: General error: 1 no such index: IDX_EA23F583EE35BD72 (SQL: DROP INDEX IDX_EA23F583EE35BD72)

[imagina]

@mikemand @nWidart I was digging in the issue and it's not Travis

Seems to be related to SQLite and PDO now failing some previously "silent" errors. Like Drop Foreign Keys and Dropping Indexes.

laravel/framework#25475

[imagina]

Ok, i found the issue. It's caused by a regression in doctrine/dbal. Downgrading to 2.10.2 fixes the problem at least in my test with PHP 7.2

Soon to be fixed on doctrine/dbal 2.10.4 doctrine/dbal#4243

I'll send a pull request to force the doctrine/dbal version to the last one working: 2.10.2

[imagina]

PR sent: #768