* Add contrib/environment-to-ini

This contrib command provides a mechanism to allow arbitrary setting
of ini values using the environment variable in a more docker standard
fashion.

Environment variable keys should be structured as:

"GITEA__SECTION_NAME__KEY_NAME"

Use of the command is explained in the README.

Partial fix for #350
Closes #7287

* Update contrib/environment-to-ini/environment-to-ini.go

Co-Authored-By: 6543 <6543@obermui.de>

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>
Co-authored-by: 6543 <6543@obermui.de>