Loki ingester couldn't transmit logs because of NoCredentialProviders error

Issue

• Logs are not transmitted to AWS S3 from LokiStack.

• Loki ingester pods are streaming below logs indefinitely:

  $ oc logs logging-loki-ingester-0 -n openshift-logging | grep NoCredentialProviders
  .........
  level=error ts=2024-06-26T13:19:57.606576446Z caller=flush.go:143 org_id=infrastructure msg="failed to flush" err="failed to flush chunks: store put chunk: NoCredentialProviders: no valid providers in chain. Deprecated.\n\tFor verbose messaging see aws.Config.CredentialsChainVerboseErrors, num_chunks: 1, labels: {kubernetes_container_name=\"osd-delete-backplane-serviceaccounts\", kubernetes_host=\"ip-xx-xx-xx-xx.<region>.compute.internal\", kubernetes_namespace_name=\"openshift-backplane\", kubernetes_pod_name=\"osd-delete-backplane-serviceaccounts-xxxxx-xxxxx\", log_type=\"infrastructure\"}"