SonarQube does not run automatically for external PRs

[julianharty]

Description
SonarQube failed for a pull request I instigated as a non-member of this codebase. See https://github.com/qontract/qontract/pull/147/checks?check_run_id=1585201400

Here is an extract from the log as the previous link may be ephemeral.

* What went wrong:
Execution failed for task ':sonarqube'.
> You're not authorized to run analysis. Please contact the project administrator.

Steps to reproduce
Submit a PR from a fork of this repo as a non-team member.

Expected behavior
The pre-submit checks should run to completion.

Screenshots

System Information:
Not very relevant.

Additional context
This was my first PR to this repo.

[joelrosario]

Thanks! @harikrishnan83 is this something you can look into?