The correct option is Create an organization Actions secret and allow only the required repositories to use it. This lets you reuse the production credential across multiple repositories while keeping centralized control and limiting access to only the teams that need it.

An organization Actions secret is defined at the organization level and can be granted to selected repositories. Workflows in those repositories can reference the secret just like a repository secret which enables a single source of truth for the credential and simplifies rotation and auditing.

Repository secrets are isolated per repository by design. Moving the credential to an organization Actions secret is the supported way to share it with only the necessary repositories while following least privilege.

Store the credential in Google Secret Manager and have each workflow fetch it at runtime is not the best choice here because it shifts secret management outside GitHub and introduces extra access configuration and bootstrap credentials. The question is solved cleanly with a native GitHub capability that provides controlled sharing.

Make the existing repository secret visible to everyone in the organization is not possible with GitHub repository secrets and it would violate least privilege by exposing a production credential to all repositories.

Encode the value with Base64 and store it in the repo so other teams can copy it is insecure because Base64 is not encryption and committing secrets to a repository exposes them to unauthorized access and history retention.

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