K8s postgres backup failed during S3 copy - postgresql

Question

I am trying to backup postgres database from RDS using K8s cronjob.
I have created cronjob for it my EKS cluster and credentials are in Secrets.
When Its try to copy backup fail into AWS S3 bucket pod fails with error:
aws: error: argument command: Invalid choice, valid choices are:
I tried different options but its not working.
Anybody please help in resolving this issue.
Here is brief info:
K8s cluster is on AWS EKS
Db is on RDS
I am using following config for my cronjob:
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: postgres-backup
spec:
schedule: "*/3 * * * *"
jobTemplate:
spec:
backoffLimit: 0
template:
spec:
initContainers:
- name: dump
image: postgres:12.1-alpine
volumeMounts:
- name: data
mountPath: /backup
args:
- pg_dump
- "-Fc"
- "-f"
- "/backup/redash-postgres.pgdump"
- "-Z"
- "9"
- "-v"
- "-h"
- "postgress.123456789.us-east-2.rds.amazonaws.com"
- "-U"
- "postgress"
- "-d"
- "postgress"
env:
- name: PGPASSWORD
valueFrom:
secretKeyRef:
# Retrieve postgres password from a secret
name: postgres
key: POSTGRES_PASSWORD
containers:
- name: save
image: amazon/aws-cli
volumeMounts:
- name: data
mountPath: /backup
args:
- aws
- "--version"
envFrom:
- secretRef:
# Must contain AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_DEFAULT_REGION
name: s3-backup-credentials
restartPolicy: Never
volumes:
- name: data
emptyDir: {}

Answer 1

Try this:
...
containers:
- name: save
image: amazon/aws-cli
...
args:
- "--version" # <-- the image entrypoint already call "aws", you only need to specify the arguments here.
...