Fix 'dubious ownership' when installing prometheus exporter

[moonlies]

When installing the prometheus monitoring exporter, the role fails when running the playbook for the second time, because the bbb-exporter's home directory, the cloned repository, is owned by the bbb-exporter user, who could modify the contents which could lead to privilege escalation. So ansible stops the playbook at that point. Retaining ownership with the root user keeps bbb-exporter from potentially being able to modify anything and the role finishes successfully.

This problem occurs when running with bbb_monitoring_external: true

[BrutalBirdie]

Odd, I always use bbb_monitoring_external but it never crashed on my on a re-run.
I will check this out.

Thanks for the PR and work ❤️

[BrutalBirdie]

Now I know why this never occurred to me.
I always use the bbb_monitoring_all_in_one_directory option which then installs it in /root/bbb-monitoring and runs in docker.

Will test again.