Use the CI/CD pipeline to inject the credentials into the application at deployment

Store the credentials in the application code and update it as needed by releasing new versions/updates to the application.

Create a secret via the console and configure secret rotation. Store the credentials in the secret. Configure the application to get the credentials from Secrets Manager using secret versions and update the secret version used by the application after every rotation and disable previous versions.

Create a secret via the CLI and configure secret rotation. Store the credentials in the secret, Configure the application to get the credentials from Secrets Manager using secret versions and update the secret version used by the application after every rotation and disable previous versions.