Gitea: [feature request] read environment variables when loading app.ini

[andrewzah]

I can take a stab at a PR if one could give me some pointers on where to start looking at.

This PR would allow checking in app.ini to version control and use it in setting up a dockerized gitea instance. Right now app.ini can't be stored in version control due to saving passwords in plaintext.

[guillep2k]

I can't find the reference, but I believe another .ini parser was considered and/or implemented that directly supported carrying settings from env variables. It was a couple of months ago. Perhaps another maintainer remembers.

[techknowlogick]

ini support was added to viper so we could switch to it and potentially use alternative formats (yaml), but also utilize env variables as well.

[zeripath]

In the meantime there is contrib/environment-to-ini

[andrewzah]

Thanks for the input! If I get time I'll take a look at viper.