fix: allow overriding target for k8s playbook
diff --git a/playbooks/kubernetes.yml b/playbooks/kubernetes.yml
index 2804861..3112310 100644
--- a/playbooks/kubernetes.yml
+++ b/playbooks/kubernetes.yml
@@ -12,7 +12,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-- hosts: all
+- hosts: "{{ target | default('all') }}"
   become: true
   roles:
     - role: sysctl