Install GitHub issues plugin

[SamoKopecky]

Additional context

Plugin that displays issues for the configured repository in the annotations of the entity.

Acceptance Criteria

• Install and configure GitHub issues plugin
• Verify that it works with existing GitHub OAuth

Relevant links

Docs: https://github.com/backstage/backstage/tree/master/plugins/github-issues

[sesheta]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[SamoKopecky]

/remove-lifecycle stale

[sesheta]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

/lifecycle stale