Relax app directory permissions in Docker

[jonatanklosko]

Closes #1192.

[josevalim]

@jonatanklosko I was also thinking we could not attempt to write the cookie file if we do not have write permission. Any preferences?

[jonatanklosko]

@josevalim but in this case we want to write the random cookie, no? I think running docker with or without --user shouldn't make a difference in this regard.

[josevalim]

@josevalim but in this case we want to write the random cookie, no?

We only write the random cookie in case you want to reuse it across restarts or something of sorts. I don't think that would be the case with Docker and you can always pass RELEASE_COOKIE yourself.

[jonatanklosko]

@josevalim ah that change was probably for consistency with the app release, where this was relevant. But either way, I don't think --user should make a difference.

[josevalim]

Your call :)