Extending Runtime Custom Resource with Additional Workers

[koala7659]

Add ability to define and modify multiple workers for a Gardener shoot in the additionalWorkers collection

Description:

Changes proposed in this pull request:

• Extending Runtime Custom Resource with additionalWorkers collection - it will allow to define more worker groups in Gardener Shoot for Kyma Runtime
• Update logic of NewProviderExtenderPatchOperation to patch Zones and version information for each Worker separately.
• Improve logic to provide provider configuration by SRE and apply on created shoot.
• InfrastructureConfig and ControlPlaneConfig are treated as immutable during update unless they are specified in the RuntimeCR

Logic flow operation update:

On shoot create:

• There must be single main worker and optional set of additional workers in additionalWorkers collection
• Additional workers can have different set of networking zones specified than main worker
• InfrastructureConfig and controlPlaneConfig are created to include ALL zones used in ALL provided workers .
• If infrastructureConfig and controlPlaneConfig are provided in RuntimeCR they will be used to create Shoot
  • If in such predefined infrastructureConfig zones cannot match with worker zones - the operation will fail

On shoot update:

• There must be single main worker and optional set of additional workers
• User can add new or remove existing workers from additionalWorkers collection. This operation will not affect existing infrastructureConfig and controlPlaneConfig
• InfrastructureConfig and ControlPlaneConfig shoot data are immutable
• For Azure and AWS shoots every zone used for each worker must be included into the set of zones used in the infrastructureConfig
• As networking zones for updated workers cannot be changed - they will be overriden with zones from Gardener on the fly fly based on the Worker name
• If infrastructureConfig and controlPlaneConfig are provided in RuntimeCR they will be used to create Shoot
  • If in such predefined infrastructureConfig zones cannot match with worker zones - the operation will fail

Additional:

• Update logic for Workers image version update during Patch operation to be aligned based on existing Gardener shoot Worker name

Related issue(s)
#46

[m00g3n]

LGTM