[doca] fix check/diff in install playbook

Signed-off-by: Bartosz Bezak <bartosz@stackhpc.com>

Author: bbezak

etc/kayobe/ansible/tools/install-doca.yml

@@ -8,6 +8,7 @@
       ansible.builtin.command:
         cmd: "uname -r"
       register: kernel
+      check_mode: false
 
     - name: Install kernel repo
       ansible.builtin.dnf: