Permission issues

[gfelot]

Thank for the tutorial and the github.

I have two linked (I think) issue with your files. I cannot upgrade from WP 4.5.2 -> 4.7 because of write access on some file/folder.

Also If I want to install a plugin it's the same. If I mkdir -p the path on /content/ ; the plugin can be installed.

I think I need to set some permission somewhere but I don't know which one.