An API Key is needed to use ggshield. Read the authentication documentation for more information.
The environment variable
GITGUARDIAN_API_KEY is used to read the intended API key.
GITGUARDIAN_API_KEY=<GitGuardian API Key>
Only metadata such as call time, request size and scan mode is stored from scans using ggshield, therefore secrets and policy breaks incidents will not be displayed on your dashboard and your files and secrets won't be stored.