How can I install aws cli, from WITHIN the ECS task? – CentOS

Question:
How can I install aws cli, from WITHIN the ECS task ?

DESCRIPTION:
I’m using a docker container to run the logstash application (it is part of the elastic family).

The docker image name is "docker.elastic.co/logstash/logstash:7.10.2"
This logstash application needs to write to S3, thus it needs AWS CLI installed.
If aws is not installed, it crashes.

# STEP 1 #
To avoid crashing, when I used this application only as a docker, I ran it in a way that I caused the ‘logstash start’ to be delayed, after docker container was started.
I did this by adding "sleep" command to an external docker-entrypoint file, before it starts the logstash.

This is how it looks in the docker-entrypoint file:
sleep 120

if [[ -z $1 ]] || [[ ${1:0:1} == '-' ]] ; then
  exec logstash "$@"
else
  exec "$@"
fi
 # EOF

# STEP 2 #
run the docker with "–entrypoint" flag so it will use my entrypoint file

docker run 
           -d 
           --name my_logstash 
           -v /home/centos/DevOps/psifas_logstash_docker-entrypoint:/usr/local/bin/psifas_logstash_docker-entrypoint  
           -v /home/centos/DevOps/logstash.conf:/usr/share/logstash/pipeline/logstash.conf 
           -v /home/centos/DevOps/logstash.yml:/usr/share/logstash/config/logstash.yml 
           --entrypoint /usr/local/bin/psifas_logstash_docker-entrypoint  
           docker.elastic.co/logstash/logstash:7.10.2

# STEP 3 #
install aws cli and configure aws cli from the server hosting the docker:

docker exec -it -u root <DOCKER_CONTAINER_ID> yum install awscli -y
docker exec -it <DOCKER_CONTAINER_ID> aws configure set aws_access_key_id <MY_aws_access_key_id>
docker exec -it <DOCKER_CONTAINER_ID> aws configure set aws_secret_access_key <MY_aws_secret_access_key>
docker exec -it <DOCKER_CONTAINER_ID> aws configure set region <MY_region>

This worked for me,
Now I want to "translate" this flow into an AWS ECS task.
in ECS I will use parameters instead of running the above 3 "aws configure" commands.

MY QUESTION
How can I do my 3rd step, installing aws cli, from WITHIN the ECS task ? (meaning not to run it on the EC2 server hosting the ECS cluster)

When I was working on the docker I also thought of these options to use the aws cli:

1. find an official elastic docker image containing both logstash and aws cli. <– I did not find one.
2. create such an image by myself and use. <– I prefer not , because I want to avoid the maintenance of creating new custom images when needed (e.g when new version of logstash image is available).

Eventually I choose the 3 steps above, but I’m open to suggestion.

Also, My tests showed that running 2 containers within the same ECS task:

1. logstah
2. awscli
   and then the logstash container will use the aws cli container
   (image "amazon/aws-cli") is not working.

THANKS A LOT IN ADVANCE 🙂