Explore using a GitHub App instead of OAuth App

[greatislander]

Is your feature request related to a problem?

GitHub recommends the use of GitHub Apps over OAuth Apps for fine-grained control and limiting access to specific repositories.

Describe the solution you'd like

We should identify what changes would be needed to authenticate using a GitHub App instead of an OAuth App.

Describe alternative solutions you've considered

Not applicable.

Additional context or notes

• https://docs.github.com/en/apps/oauth-apps/building-oauth-apps/differences-between-github-apps-and-oauth-apps
• https://docs.github.com/en/apps/creating-github-apps/writing-code-for-a-github-app/building-a-login-with-github-button-with-a-github-app