Add operators to suport allocating empty bare-metal.

[sailorvii]

User Story

As developers, we are developing a feature to support a bare-metal platform. I'm not sure if it's useful for others.

Detailed Description

In our scenario, some customers like to acquire an empty bare-metal host or a group of hosts.
Furthermore, users hope that host could pre-install the customized application.
It's a pure bare-metal management platform without guest Kubernetes.

Anything else you would like to add:
A machine operator, a machine-deployment operator.

[Miscellaneous information that will assist in solving the issue.]
The user could specify the machine with some conditions:

1. Image to be installed.
2. Host label to be chosen.
3. User data specified by the customer such as "what application I want to install at the start time".

A machine deployment will define a group of machines with the same configuration. It will define the number of replicas. It could scale up/down.

/kind feature

[Rozzii]

The community is willing to continue the discussion if you provide a design document PR in metal3-docs repository.
Based on the design document the community will decide whether it is OK to continue with the implementation or not.

Also please not that using the "machine" word has issues in our community because it refers to the Machine object in Metal3 context so please refrain from using it if you are not specifically mean the Machine object.
Please note that at the moment we don't have resources to implement this feature so if it is accept you have to do the implementation.
/triage accepted

[sailorvii]

I'll provide the design document soon.

[metal3-io-bot]

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/lifecycle stale

[furkatgofurov7]

/remove-lifecycle stale

[sailorvii]

Is there anybody who could help to review the proposal metal3-io/metal3-docs#268? Thanks.

[metal3-io-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
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/lifecycle stale

[Rozzii]

/remove-lifecycle stale

[furkatgofurov7]

/remove-lifecycle stale

[metal3-io-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues will close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[Rozzii]

I think in principle we should support this use-case

[Rozzii]

/life-cycle-frozen