feat(redis) support spec tests with redis cluster

Kong currently does not support connection to redis cluster and will
be fixed in FTI-2104.

For pongo to support redis cluster, we need to define the Pongo
network with custom subnet (required by Docker Compose).

Also, we should support an ENV to load redis cluster seeds:
KONG_SPEC_TEST_REDIS_CLUSTER_ADDRESSES

assets/docker-compose.yml

@@ -3,6 +3,12 @@ version: '3.5'
 networks:
   pongo-test-network:
     name: ${SERVICE_NETWORK_NAME}
+    driver: bridge
+    attachable: true
+    ipam:
+      config:
+      - subnet: 192.168.56.0/21
+        gateway: 192.168.56.1
 
 services:
   expose:

assets/pongo_entrypoint.sh

@@ -69,6 +69,8 @@ export KONG_LOG_LEVEL=debug
 export KONG_SPEC_REDIS_HOST=redis
 # Kong test-helpers 3.0.0+
 export KONG_SPEC_TEST_REDIS_HOST=redis
+# Support Redis Cluster
+export KONG_SPEC_TEST_REDIS_CLUSTER_ADDRESSES='["rc-node-1:6379","rc-node-2:6379","rc-node-3:6379"]'
 
 # set the certificate store
 export KONG_LUA_SSL_TRUSTED_CERTIFICATE=/etc/ssl/certs/ca-certificates.crt