Replace default GitHub avatar

[mr-chok]

Solves #688

• Added a new user field: has_identicon, calculated through an async job dispatched at user signup.
• Used has_identicon field in the avatar component to decide the picture to be shown.
  Note: The only existing GitHub test (GitHubUserTest.php) doesn’t cover HTTP requests. My contribution depends on the HTTP client bootstrap, so adding tests would require extra Pest setup I wasn’t sure to include.

Final view of some users created through the local tests:

[driesvints]

Thanks a lot for this one! Gonna try out the backfill of identicons in a bit.

[driesvints]

The logic here was incorrect:

return ! ($width === 420 && $height === 420);

Should have been:

return $width === 420 && $height === 420;

It's fine, I'm gonna re-run the backfill.

[sentry-io]

Issues attributed to commits in this pull request

This pull request was merged and Sentry observed the following issues:

• ‼️ Illuminate\Http\Client\RequestException: HTTP requ... in production

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[driesvints]

The queue is still going but starting to look pretty good. Identicons on the homepage are starting to disappear 🥳

Thanks!

[mr-chok]

Sorry and thanks about the returning logic, I may have passed that when rebasing.
Happy to help! 🙌🏽