kubectl wait: add page (#15441)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/kubectl-wait.md

@@ -0,0 +1,20 @@
+# kubectl wait
+
+> Wait for resource(s) to reach a certain state.
+> More information: <https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#wait>.
+
+- Wait for a deployment to become available:
+
+`kubectl wait --for=condition=available deployment/{{deployment_name}}`
+
+- Wait for all pods with a certain [l]abel to be ready:
+
+`kubectl wait --for=condition=ready pod -l {{label_key}}={{label_value}}`
+
+- Wait for a pod to be deleted:
+
+`kubectl wait --for=delete pod {{pod_name}}`
+
+- Wait for a job to complete, within 120 seconds (if the condition isn't met on time, the exit status will be unsuccessful):
+
+`kubectl wait --for=condition=complete job/{{job_name}} --timeout 120s`