gitleaks: Ignore mock SSH keys
gitleaks: Ignore mock SSH keys

Quiesce Red Hat's security scanner about allegedly leaking private SSH
keys. These are static keys for our unit tests.

martinpitt/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit