Fix issue cleaning up /src

```
failed to solve: process "/bin/sh -c sudo rmdir /src" did notcomplete
successfully
```

There seems to be a change in behaviour where this folder is no longer
left behind; possibly docker version related? This change works around
the issue by swallowing the error in case of error.

docker/kayobe/Dockerfile

@@ -89,7 +89,7 @@ RUN --mount=type=ssh,uid=1000 --mount=type=tmpfs,target=/tmp/src --mount=type=bi
   rm -rf /stack/kayobe-automation-env/src/kayobe-config
 
 # Symlinking to /src would create a link within the empty directory
-RUN sudo rmdir /src
+RUN sudo rmdir /src || true
 
 ENV ANSIBLE_ROLES_PATH="/stack/.ansible/kayobe-automation-roles:~/.ansible/roles:/usr/share/ansible/roles:/etc/ansible/roles"
 ENV ANSIBLE_COLLECTIONS_PATH="/stack/.ansible/kayobe-automation-collections:~/.ansible/collections:/usr/share/ansible/collections"