redirect loop due to non standard path handling

Problem/Motivation

After clean install and vhost from nginx.org example ht path handling does not work.
At leas not behind a transparent proxy.

Steps to reproduce

Download and install rocketship → distribution.
Configure it to be behind a transparent nginx or caddy proxy.

Proposed resolution

add special image location handler in the nginx vhost

Add the following codeblock between image handling and private files.

    location ~ ^/drimage/ {
        try_files $uri /index.php?$query_string;
    }

reload nginx config.

Remaining tasks

Better implement it directly in imagecache

User interface changes

none

API changes

none

Data model changes