MySQL improvements

[github-actions]

This PR Closes #64 and implements improvements MySQL authentication. There are more tools than not out there that gets confused with passwordless databases, with PR we are adding a password for remote authentication, while authentication using root user on localhost remains passwordless.

1. root@localhost

Localhost authentication for root user is passwordless, using auth_socket authentication plugin, for more info see: https://dev.mysql.com/doc/refman/8.0/en/socket-pluggable-authentication.html

2. admin@% and admin@localhost

A new admin user has been added to handle remote and none privileged authentication on localhost, using the mysql_native_passwordplugin, for more info see: https://dev.mysql.com/doc/refman/8.0/en/native-pluggable-authentication.html

See: https://medium.com/@crmcmullen/how-to-run-mysql-8-0-with-native-password-authentication-502de5bac661

Credentials

• user: admin
• pass: admin

Can be configured using the MYSQL_USER and MYSQL_PASS env variable.

mbind: Operation not permitted messages in logs

Issue and the solution is explained here: https://stackoverflow.com/questions/55559386/how-to-fix-mbind-operation-not-permitted-in-mysql-error-log

From the thread:

Without CAP_SYS_NICE enabled, MySQL won't be able to handle thread priorities, and I guess you will then loose a new feature introduced with MySQL 8 (I believe Resource Groups dev.mysql.com/doc/refman/8.0/en/resource-groups.html). MySQL should warn us once during startup. Instead (not sure whether it is still the case nowadays), it fills the disk with this message.

[johanjanssens]

One small change rest is looking great