Add social authentication using django-allauth

[Xpirix]

Closes #275

Changes summary

• This will allow users to log in with their Google/GitHub account.
• At first login, users are prompted to choose their user name.
• If the same username or email already exists in the DB (local or LDAP users), it will generate an error notification accordingly
• Keep the login from LDAP and local account (username + password)

Requirements

• This requires setting up OAuth keys on Google and GitHub and pasting them into the app to work correctly.
• A new image build is also needed.

[timlinux]

This is great let's aim to add codeberg, gitlab, osm, microsoft, apple, linked in.

Do bluesky and mastodon have oauth providers too?

[Xpirix]

This is great let's aim to add codeberg, gitlab, osm, microsoft, apple, linked in.

Do bluesky and mastodon have oauth providers too?

Codeberg, Bluesky, and Mastodon are not supported by django-allauth yet. I've added other providers and a doc on how to set them up: https://github.com/Xpirix/QGIS-Plugins-Website/blob/a7bb9ddc9d499a8f758bd624cba2aaab9c1e3115/docs/oauth-setup.md

[saifeldinkhedir-coder]

Hi @Xpirix, I wanted to gently follow up on this PR request. All CI checks are passing and there are no merge conflicts. Whenever you have a moment to review, I would greatly appreciate your feedback. Thank you for your time and for maintaining QGIS!

[Xpirix]

Hi @saifeldinkhedir-coder , please note that we still need to set up each provider alongside the deployment of this PR. We will probably do that later this week or next week.

[saifeldinkhedir-coder]

Thank you @Xpirix for the update! I appreciate you letting me know. I will wait and I am available whenever you are ready. 🙏

[timlinux]

LGTM

[saifeldinkhedir-coder]

Thank you so much @timlinux and @Xpirix! 🙏

I am truly honored to have my contribution accepted into the official QGIS Plugins repository. Your time, effort, and guidance throughout this review process means a great deal to me.

Thank you for maintaining such an incredible open-source project that serves researchers and communities worldwide. I hope to continue contributing and giving back to the QGIS ecosystem. 🌍