Wiki: Fix oauth, create role from playbook

playbooks/roles/dokuwiki/README.md

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+# Role `dokuwiki`
+
+Makes sure that all required packages for a [DokuWiki](https://www.dokuwiki.org/dokuwiki) powered by php-fpm are installed.
+
+The DokuWiki tarball has to be unpacked to `/var/www/dokuwiki` (see variable below) manually afterwards.
+Please download it from https://download.dokuwiki.org.
+
+## Supported Distributions
+
+The following distributions are supported:
+
+- Debian 11
+
+## Required Arguments
+
+None.
+
+## Optional Argument
+
+- `dokuwiki__installpath`: Where your DokiWiki lives, default `/var/www/dokuwiki`
+- `dokuwiki__php_version`: Your PHP version, default `7.4`
+- `dokuwiki__php_user`: User of your php-fpm process, default `www-data`
+- `dokuwiki__nginx_user`: User of your nginx process, default `nginx`
+
+## nginx Configuration
+
+This role does not configure your nginx server.
+Please take a look at https://www.dokuwiki.org/install:nginx for a starting point.
+
+This role expects to work with our `nginx` role, which installs nginx from nginx's repo instead of Debian's package.
+This means, that nginx will not run as the `www-data`, which is used by php-fpm.
+
+So your `server` directive in the nginx configuration needs to use:
+```conf
+  root /var/www/dokuwiki;
+
+  [...]
+
+  location ~ \.php$ {
+    [...]
+    fastcgi_pass unix:/var/run/php/php-fpm-dokuwiki.sock;
+  }
+```
+
+
+## Updates
+
+This role doesn't handle updates.
+Please use the updater from Dokuwiki's admin interface to install updates.