Install plugins and theme sameersbn/redmine

Hello,
I can’t install plugins https://github.com/RCRM/redmine_agile
after installation of my redmine docker.

I copy plugin in :
/usr/src/redmine/plugins

and I run command :
rake redmine:plugins NAME=redmine_agile RAILS_ENV=production

The console return error :
Could not load database configuration. No such file - [“config/database.yml”]

I configure it but it does not work.

Documentation :
https://hub.docker.com/r/sameersbn/redmine/#plugins