[Release-1.28] - Add etcd snapshot s3 config secret support

[brandond]

Backport fix for Add etcd snapshot s3 config secret support

• Add etcd snapshot s3 config secret support #10370

[VestigeJ]

$ sudo /usr/local/bin/k3s etcd-snapshot save --etcd-s3 --etcd-s3-config-secret k3s-etcd-snapshot-s3-config

WARN[0000] Unknown flag --node-external-ip found in config.yaml, skipping
WARN[0000] Unknown flag --server found in config.yaml, skipping
WARN[0000] Unknown flag --token found in config.yaml, skipping
WARN[0000] Unknown flag --write-kubeconfig-mode found in config.yaml, skipping
WARN[0000] Unknown flag --cluster-init found in config.yaml, skipping
WARN[0000] Unknown flag --etcd-snapshot-schedule-cron found in config.yaml, skipping
WARN[0000] Unknown flag --etcd-s3-secret found in config.yaml, skipping
INFO[0000] Snapshot on-demand-ip-1-1-1-10-1721864916.zip saved.
INFO[0000] Snapshot on-demand-ip-1-1-1-10-1721864916.zip saved.

$ sudo /usr/local/bin/k3s etcd-snapshot ls --etcd-s3 --etcd-s3-config-secret k3s-etcd-snapshot-s3-config

WARN[0000] Unknown flag --node-external-ip found in config.yaml, skipping
WARN[0000] Unknown flag --server found in config.yaml, skipping
WARN[0000] Unknown flag --token found in config.yaml, skipping
WARN[0000] Unknown flag --write-kubeconfig-mode found in config.yaml, skipping
WARN[0000] Unknown flag --cluster-init found in config.yaml, skipping
WARN[0000] Unknown flag --etcd-snapshot-schedule-cron found in config.yaml, skipping
WARN[0000] Unknown flag --etcd-s3-secret found in config.yaml, skipping
Name                                     Location                                                                                 Size    Created
on-demand-ip-1-1-1-10-1721864916.zip s3://buckets/needed/on-demand-ip-1-1-1-10-1721864916.zip             579898  2024-07-24T23:48:36Z

$ cat s3.yaml

apiVersion: v1
kind: Secret
metadata:
  name: k3s-etcd-snapshot-s3-config
  namespace: kube-system
stringData:
  etcd-s3-endpoint: "s3.us-east-2.amazonaws.com"
  etcd-s3-endpoint-ca: ""
  etcd-s3-endpoint-ca-name: ""
  etcd-s3-skip-ssl-verify: "true"
  etcd-s3-access-key: "wrekt"
  etcd-s3-secret-key: "nooooooooooo"
  etcd-s3-bucket: "buckets"
  etcd-s3-region: "us-east-2"
  etcd-s3-insecure: "false"
  etcd-s3-timeout: "5m"
  etcd-s3-folder: "needed"
  etcd-s3-proxy: ""