Merge pull request 'nextcloud: docs how to get debug logs' (#238) from nextcloud-fix-logs into main

Reviewed-on: #238
Reviewed-by: hensoko <hensoko@noreply.git.pub.solar>
Reviewed-by: b12f <b12f@noreply.git.pub.solar>

docs/nextcloud.md

@@ -0,0 +1,19 @@
+# Nextcloud debugging
+
+Set loglevel to `0` for debug logs:
+
+```nix
+services.nextcloud.settings.loglevel = 0;
+```
+
+Then, logs appear in the `phpfpm-nextcloud.service` logs:
+
+```bash
+sudo journalctl -fu phpfpm-nextcloud
+```
+
+Make sure to set the loglevel back to the default `2` warning after debugging:
+
+```nix
+services.nextcloud.settings.loglevel = 2;
+```