Create the MVP of flame-operator

[k82cn]

Motivation

Curerntly, the Flame can be installed in bare-metal by flmadm, or deploy a dev environment by docker compose.
But in most of case, it's more convient for end-user to deploy it in Kubernetes by Operator.

In this issue, we'd like to build the MVP of flame-operator to simplify the deployment of Flame in Kuberentes cluster.

Function Specification

1. The CRD (CustomResourceDefinitions) FlameCluster should include all information about Flame cluster
2. For each FlameCluster, the operator should create one pod for flame-session-manager, and several pods for flame-executor-manager
3. The FlameCluster.spec.replica should be used to define the number of flame-executor-manager pod

References

• Flame: https://github.com/xflops/flame/
• Operator pattern: https://kubernetes.io/docs/concepts/extend-kubernetes/operator/
• Kubebuilder: https://github.com/kubernetes-sigs/kubebuilder
• CustomResourceDefinitions: https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/

[k82cn]

@xflops-bot , who/when will setup a github workflow for CI?

[k82cn]

please create a PR for the github workflow.

[k82cn]

ok, I createed it manually.