feat: github teams sync

[Aiq0]

No description provided.

[Copilot]

Pull request overview

This PR adds GitHub Teams synchronization to Trojsten ID by introducing a new GitHub sync module, wiring it into existing background jobs and signals, and exposing required configuration via settings and environment variables.

Changes:

• Add GitHub Teams sync implementation and a management command to trigger it manually.
• Extend the existing “group sync” background job to also sync GitHub teams, and trigger GitHub sync for a user when their GitHub SocialAccount is saved.
• Add PyGithub dependency and configuration knobs (GITHUB_APP_*, GITHUB_ORG_NAME, GITHUB_TEAMS) to settings and .env.example.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
uv.lock	Locks new dependency set including pygithub and transitive deps.
pyproject.toml	Adds pygithub as an application dependency.
trojstenid/settings.py	Adds GitHub provider config for allauth and new GitHub sync settings sourced from env.
.env.example	Documents environment variables needed for GitHub sync.
trojstenid/users/github.py	New GitHub Teams sync logic using GitHub App auth and org/team APIs.
trojstenid/users/tasks.py	Renames/extends group sync job and adds a per-user GitHub sync job.
trojstenid/users/views.py	Updates admin-triggered sync to call the new combined sync job.
trojstenid/users/signals.py	Updates confirmed-email sync to new job; adds SocialAccount post-save hook for GitHub.
trojstenid/users/management/commands/syncgithubteams.py	Adds CLI management command to run GitHub team sync.

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