Fix integration test for ddb-docker-compose project

Author: knjtnk

examples/ddb-docker-compose/README.md

@@ -16,6 +16,7 @@ services:
   # In this case, lambda function container have to call dynamodb api to `ddb` host.
   ddb:
     image: amazon/dynamodb-local:latest
+    container_name: ddb_local
     ports:
       - 8000:8000
     networks:

examples/ddb-docker-compose/docker-compose.yml

@@ -3,6 +3,7 @@ version: '3'
 services:
   ddb:
     image: amazon/dynamodb-local:latest
+    container_name: ddb_local
     ports:
       - 8000:8000
     networks:

examples/ddb-docker-compose/test.sh

@@ -24,8 +24,9 @@ fi
 docker-compose up -d
 
 echo "wait until dynamodb-local is running"
+# We have to specify container name because default nameing rule is defferent from mac and linux. See: https://github.com/docker/for-mac/issues/6035
+CONTAINER_NAME=ddb_local # defined in docker-compose.yml
 RETRY=30
-CONTAINER_NAME=ddb-docker-compose-ddb-1
 until [ "$( docker container inspect -f '{{.State.Running}}' $CONTAINER_NAME )" == "true" ]
 do
     if [ $RETRY -ge 0 ]