[Release-1.27] - Etcd s3 config secret support

[brandond]

Backport fix for Etcd s3 config secret support

• Etcd s3 config secret support #6113

[VestigeJ]

$ sudo /usr/local/bin/rke2 etcd-snapshot save --etcd-s3 --etcd-s3-config-secret rke2-etcd-secret

WARN[0000] Unknown flag --node-external-ip 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 --cni found in config.yaml, skipping
WARN[0000] Unknown flag --profile found in config.yaml, skipping
WARN[0000] Unknown flag --selinux found in config.yaml, skipping
WARN[0000] Unknown flag --embedded-registry 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[0001] Snapshot on-demand-ip-1-1-1-8-1721943966.zip saved.
INFO[0001] Snapshot on-demand-ip-1-1-1-8-1721943966.zip saved.

$ cat secret.yaml

apiVersion: v1
kind: Secret
metadata:
  name: rke2-etcd-secret
  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: "false"
  etcd-s3-access-key: "roflseagullsaretheworst"
  etcd-s3-secret-key: "mystickisbetterthanbacon"
  etcd-s3-bucket: "seagulls-say-ah-ah-ah"
  etcd-s3-region: "us-east-2"
  etcd-s3-folder: "needed"
  etcd-s3-insecure: "false"
  etcd-s3-timeout: "5m"
  etcd-s3-proxy: ""

$ kgn

NAME              STATUS   ROLES                       AGE     VERSION
ip-1-1-1-4        Ready    control-plane,etcd,master   7m51s   v1.27.16+rke2r1
ip-1-1-1-8        Ready    control-plane,etcd,master   10m     v1.27.16+rke2r1
ip-1-1-1-12       Ready    control-plane,etcd,master   7m34s   v1.27.16+rke2r1
ip-1-1-1-24       Ready    <none>                      8m35s   v1.27.16+rke2r1

$ rke2 -v

rke2 version v1.27.16-rc4+rke2r1 (4f40ff06079f648f3194b344c4199997a970614d)
go version go1.22.5 X:boringcrypto