Suppress "can't find SSH key" warning

[elruwen]

Hi!

I would like to be able to suppress the
The repository "git@XXX" appears to use SSH for transport, but the elastic-ci-stack-s3-secrets-hooks plugin did not find any SSH keys in the "my-bucket" S3 bucket.

warning.

I manage the SSH key myself via the environment hook. The above message confuses people.

The idea would be an environment variable to suppress it. Are you fine with it?

Cheers
Ruwen