Container exits successfully even if s3 upload fails

[alexklibisz]

Hi, thanks for this project. Here's an issue I recently found. If the AWS upload fails for some reason (e.g., bad credentials), the backup script still proceeds as if nothing happened.

Here's an example where I intentionally messed up the AWS credentials:

[INFO] Uploading backup to S3

Will upload to bucket "***-backups"
upload failed: ./***-2022-11-27T17-47-09.tar.gz to s3://***-backups/***-2022-11-27T17-47-09.tar.gz An error occurred (SignatureDoesNotMatch) when calling the PutObject operation: The request signature we calculated does not match the signature you provided. Check your key and signing method.
Upload finished

...

[INFO] Backup finished

Will wait for next scheduled backup

It seems to be the expected behavior should be to fail the script.