creating a secret using the AWS CDK

cdk-secret.ts

    // first, lets generate a secret to be used as credentials for our database
    const databaseCredentialsSecret = new secretsManager.Secret(this, `${env}-DBCredentialsSecret`, {
      secretName: `${env}-rds-credentials`,
      generateSecretString: {
        secretStringTemplate: JSON.stringify({
          username: 'postgres',
        }),
        excludePunctuation: true,
        includeSpace: false,
        generateStringKey: 'password'
      }
    });