Reign in Cassandra memory consumption when running tests

The environment variables are the same as the Cassandra Testcontainers
uses.

spring-boot-project/spring-boot-docker-compose/src/test/resources/org/springframework/boot/docker/compose/service/connection/cassandra/cassandra-compose.yaml

@@ -4,4 +4,9 @@ services:
     ports:
       - '9042'
     environment:
+      - 'CASSANDRA_SNITCH=GossipingPropertyFileSnitch'
+      - 'JVM_OPTS=-Dcassandra.skip_wait_for_gossip_to_settle=0 -Dcassandra.initial_token=0'
+      - 'HEAP_NEWSIZE=128M'
+      - 'MAX_HEAP_SIZE=1024M'
+      - 'CASSANDRA_ENDPOINT_SNITCH=GossipingPropertyFileSnitch'
       - 'CASSANDRA_DC=dc1'