Add CI.

Issue #3296389 by afagioli, vinaygawade, VladimirAus: Error: Cannot call abstract method Drupal\Core\Messenger\MessengerInterface::addMessage() in animate_css_install()

Closes #3448525

assigned to @VladimirAus

changed target branch from master to 2.1.x

added 2 commits

• 4b3b0570 - 1 commit from branch project:2.1.x
• 3f6701fc - Issue #3448525 by VladimirAus, jannakha: Add Gitlab CI to module

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added 1 commit

• 37070efa - Issue #3448525 by VladimirAus, jannakha: Add Gitlab CI to module

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merged