Document Troubleshooting permission on the server

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I've created a new document: https://github.com/wmde/fundraising-infrastructure/wiki/How-to-deal-with-permission-errors-on-deployment
Please read it and tell me if something is missing/unclear.

We had some cache errors after the last deployment that were unrelated to permissions IMHO (cache directory was writable, but file path showed old release timestamp), we'll have to watch this issue.

looks good to me, but before moving this to Done, @AbbanWMDE also should have had a look