change uv cache dir

docs/developer/cicd_runner.md

@@ -109,6 +109,13 @@ SocketMode=0660
 SocketGroup=podman
 ```
 
+Created uv cache dir, for `UV_CACHE_DIR`:
+
+```
+sudo mkdir -m 777 /var/cache/uv
+```
+
+TODO: this may not be necessary anymore:
 Change the location of the working directory (uv .venvs are built here, take up lots of space)
 
 ```