enable ecs spot instance draining

Author: wleepang

src/templates/gwfcore/gwfcore-launch-template.template.yaml

@@ -118,6 +118,9 @@ Resources:
                 - export GWFCORE_NAMESPACE=${Namespace}
                 - export INSTALLED_ARTIFACTS_S3_ROOT_URL=$(aws ssm get-parameter --name /gwfcore/${Namespace}/installed-artifacts/s3-root-url --query 'Parameter.Value' --output text)
 
+                # enable ecs spot instance draining
+                - echo ECS_ENABLE_SPOT_INSTANCE_DRAINING=true >> /etc/ecs/ecs.config
+
                 - cd /opt
                 - aws s3 sync $INSTALLED_ARTIFACTS_S3_ROOT_URL/ecs-additions ./ecs-additions
                 - chmod a+x /opt/ecs-additions/provision.sh