Fix flaky Cassandra container test by using CommandWaitStrategy

Author: jarlah

lib/container/cassandra_container.ex

@@ -5,7 +5,7 @@ defmodule Testcontainers.CassandraContainer do
   """
 
   alias Testcontainers.CassandraContainer
-  alias Testcontainers.LogWaitStrategy
+  alias Testcontainers.CommandWaitStrategy
   alias Testcontainers.ContainerBuilder
   alias Testcontainers.Container
 
@@ -89,8 +89,8 @@ defmodule Testcontainers.CassandraContainer do
       |> with_environment(:CASSANDRA_ENDPOINT_SNITCH, "GossipingPropertyFileSnitch")
       |> with_environment(:CASSANDRA_DC, "datacenter1")
       |> with_waiting_strategy(
-        LogWaitStrategy.new(
-          ~r/Starting listening for CQL clients on \/0\.0\.0\.0:#{CassandraContainer.default_port()}.*/,
+        CommandWaitStrategy.new(
+          ["cqlsh", "-e", "describe keyspaces"],
           config.wait_timeout
         )
       )