Feature/backup

[alexarefev]

Description

• Make backup/restore procedure more flexible and independent from backup_location option

Solution

• Code changes in backup procedure to save backup archive on the control plane nodes
• Code changes in restore procedure to restore from backup archive on the control plane nodes
• Documentation update

Test Cases

TestCase 1
Check if backup archive is stored on the control plane nodes

Test Configuration:

• Hardware: 4CPU/8GB
• OS: Ubuntu 22.04
• Inventory: miniHA

Steps:

1. Install K8S cluster
2. Run backup procedure

Results:

Before	After
Not applicable	archive additionally stored on control plane nodes in /etc/kubemarine/backup.tar.gz

TestCase 2
Check if restore procedure could use archive from the control plane nodes

Test Configuration:

• Hardware: 4CPU/8GB
• OS: Ubuntu 22.04
• Inventory: miniHA

Steps:

1. Install K8S cluster
2. Set backup_location: '' in procedure.yaml
3. Run restore procedure

Results:

Before	After
Success	Success

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• There is no breaking changes, or migration patch is provided
• Integration CI passed
• Unit tests. If Yes list of new/changed tests with brief description
• There is no merge conflicts