Add notes about CRI-O specific config (#2546)

CRI-O currently requires some additional config for pipelines to run.
This adds some basic documentation to the kubernetes section explaining
the issue.

See #2510

docs/docs/30-administration/22-backends/40-kubernetes.md

@@ -134,3 +134,17 @@ steps:
         - "woodpecker-cache"
     [...]
 ```
+
+## Tips and tricks
+
+### CRI-O
+
+CRI-O users currently need to configure the workspace for all workflows in order for them to run correctly. Add the following at the beginning of your configuration:
+
+```yml
+workspace:
+  base: "/woodpecker"
+  path: "/"
+```
+
+See [this issue](https://github.com/woodpecker-ci/woodpecker/issues/2510) for more details.