Fix GitHub OAuth2 for accounts without email

[MarcHagen]

So maybe I'm one of the few people using the GitHub OAuth.
But it not working correctly.

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It throws an error:

Symfony\Component\Security\Http\Authenticator\Passport\Badge\UserBadge::__construct(): Argument #1 ($userIdentifier) must be of type string, null given, called in /var/www/packagist/src/Integrations/Security/OAuth2Authenticator.php on line 79

This is because $event->getPassport()?->getUser()->getUserIdentifier() returns null. which is not accepted by logWebLogin

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So that fixes one issue, but yes, another one arose. (like always...)

Symfony\Component\Security\Http\Authenticator\Passport\Badge\UserBadge::__construct(): Argument #1 ($userIdentifier) must be of type string, null given, called in /var/www/packagist/src/Integrations/Security/OAuth2Authenticator.php on line 79

So appears $response['email'] is NULL on my account,
this is because I've enabled the GitHub option: Keep my email addresses private

So in this case, we can use the username as user_identifier.
Further down in the public function createUser it breaks hard on the same issue with email as a database constrained.
I've copied the $email part from BaseIntegrationTrait.

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Also added .docker to the gitignore and renamed the Phpunit folder to PHPUnitOverride.
As phpunit the file and Phpunit the folder will not work on windows due to naming stuff and ... windows.

[vtsykun]

Thanks!

[REBELinBLUE]

@vtsykun Any chance of a new docker image release with this fix included anytime soon?