Provisioning of MySQL users

[simonmarty]

Discussed in #150

^{Originally posted by estahn October 31, 2024}
It would be great for the rotation function to create the user if it's not existing and grant the required permissions. This would act as an operator to sync secrets manager with MySQL users.

The secret would probably require to contain some further settings, e.g.

{
   "dbClusterIdentifier":"foboar",
   "engine":"mysql",
   "host":"myhost.ap-southeast-2.rds.amazonaws.com",
   "password":"foobarfoobarfoobar",
   "port":"3306",
   "username":"test-deleteme",
   "masterarn":"arn:aws:secretsmanager:ap-southeast-2:12345:secret:rds!cluster-0361984b970e",
   "rotate_cfg_user_host":"%",
   "rotate_cfg_grants":"SELECT, INSERT, UPDATE, DELETE ON `mydb`.*"
}