Can't disable auth when using docker image about phpredmin

[luongvm]

@conet please check #93, I just wrote this.

As I inspected, the config would not unset a config node that has children, so PHPREDMIN_AUTH= didn't work for me. (Need verification on this).

After #93 is merged you will be able to disable authentication by setting username to empty.

[luongvm]

@conet if you run by one liner you can't do that. but if you use docker-compose or rebuild the docker image mabe you can modify the config.dist.php file and remove the auth section.

I'm pushing up a PR where you can disable auth by setting the PHPREDMIN_AUTH_USERNAME variable to empty.

[conet]

Yeah I know that, but I want to be able to do it using environment variables only, rebuilding or mounting files makes a composition less self-contained, plus there is this statement on the main page:

Note: As you can see you can use ENV variables to override any configuration directive of PHPRedmin.

[conet]

It looks good, thanks.

[Delagen]

Use volume mapping to override default config.php and all works (remove auth section)