Update integrated Restic version and add insecureSkipTLSVerify for Re…

[blackpiglet]

…stic CLI

1. Add --insecure-tls for ResticManager's commands.
2. Add --insecure-tls in PodVolumeBackup and PodVolumeRestore controller.
3. Upgrade integrated Restic version to v0.13.1
4. Change --last flag in Restic command to --latest=1 due to Restic version update.

Signed-off-by: Xun Jiang jxun@vmware.com

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Does your change fix a particular issue?

Fixes #4820

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• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[blackpiglet]

Test done for this modification:

Setup MinIO with TLS:

1. Install certgen, then add certgen into PATH: 
go install[ github.com/minio/certgen](http://github.com/minio/certgen)
2. Generate key and cert: 
certgen -ca -host "127.0.0.1,minio.velero.svc,minio.minio.svc"
3. Create TLS needed secret from generated key and cert: 
kubectl create ns minio; kubectl -n minio create secret generic tls-ssl-minio --from-file=./private.key --from-file=./public.crt
4. Install MinIO with TLS enabled by helm chart: 
helm repo add minio https://charts.min.io/; helm install minio -n minio --set tls.enabled=true,tls.certSecret=tls-ssl-minio,replicas=1,persistence.enabled=true,resources.requests.memory=1Gi,mode=standalone,rootUser=minio,rootPassword=minio123 minio/minio
5. Setup up MinIO host and add bucket:
kubectl apply -f https://raw.githubusercontent.com/blackpiglet/public_files/main/minio-setup.yaml

Install Velero with the MinIO and not provide CA to Velero and Restic.

velero install \
  --provider aws \
  --plugins velero/velero-plugin-for-aws:main \
  --image=gcr.io/velero-gcp/velero:test \
  --bucket=velero \
  --use-volume-snapshots=false \
  --backup-location-config region=minio,s3ForcePathStyle="true",s3Url=https://minio.minio.svc:9000,insecureSkipTLSVerify=true \
  --use-restic \
  --secret-file=../../credentials-velero-minio \
  --default-volumes-to-restic

Tests:

• Create a deployment on K8S cluster with PV
• Create backup with no error: velero backup create 4821-2 --selector app=redis
• Check the ResticRepository is created and Status.Phase is ready.
• Modify ResticRepository's Spec.MaintenanceFrequency to 1m0s, and check the periodically Restic prune command running without error.
• Create restore with no error: velero restore create --from-backup=4821-2
• Delete backup with no error: velero backup delete 4821-2