| `TBC_GCP_PROVIDER_IMAGE` | The [GCP Auth Provider](https://gitlab.com/to-be-continuous/tools/gcp-auth-provider) image to use (can be overridden) | `registry.gitlab.com/to-be-continuous/tools/gcp-auth-provider:main` |
| `TBC_GCP_PROVIDER_IMAGE` | The [GCP Auth Provider](https://gitlab.com/to-be-continuous/tools/gcp-auth-provider) image to use (can be overridden) | `registry.gitlab.com/to-be-continuous/tools/gcp-auth-provider:latest` |
| `gcp-oidc-aud` / `GCP_OIDC_AUD` | The `aud` claim for the JWT token | `$CI_SERVER_URL` |
| `gcp-oidc-provider` / `GCP_OIDC_PROVIDER` | Default Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) | _none_ |
| `gcp-oidc-account` / `GCP_OIDC_ACCOUNT` | Default Service Account to which impersonate with OpenID Connect authentication | _none_ |