Merge pull request #7290 from apelisse/patch-4

Add kubectl-validate channel

Author: k8s-ci-robot

communication/slack-config/channels.yaml

@@ -250,6 +250,7 @@ channels:
   - name: kubebuilder
   - name: kubecon
   - name: kubectl-trace
+  - name: kubectl-validate
   - name: kubedb
   - name: kubeinit
   - name: kubekhan