The correct option is Create the secret at the organization level.

Create the secret at the organization level lets you centrally manage a secret and make it available to workflows across many repositories. Organization-level secrets in GitHub Actions can be scoped to all repositories or to a selected set of repositories and they are the supported built in way to share secrets across an organization.

Use Google Secret Manager to centralize the secret is incorrect because GitHub Actions does not automatically consume secrets stored outside GitHub. You can build integrations that fetch secrets from external stores but that is not the straightforward first step to share a secret across multiple GitHub repositories and it adds complexity.

Recreate the secret at the repository level is incorrect because duplicating the secret in each repository is time consuming and error prone. The question asks to make the secret available across multiple repositories so managing the secret at the organization-level is the appropriate first action.

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