MK8S-71 - platform-disk-management-agent: Initialize repository

[vdaviot]

Summary

Initialize the platform-disk-management-agent operator repository using Operator SDK with kubebuilder v4 scaffolding.

• Repository bootstrap: Scaffold the project with operator-sdk init and operator-sdk create api, generating the base boilerplate (Makefile, Dockerfile, go.mod, PROJECT, cmd/main.go, etc.)
• DiscoveredPhysicalDisk CRD: Define a new v1alpha1 custom resource under the metalk8s.scality.com API group with Spec and Status subresource, along with admin/editor/viewer RBAC roles and a stub reconciler
• DaemonSet deployment model: Convert the default Deployment-based manager into a DaemonSet so the agent runs on every node; remove leader election resources (role + role binding) that are unnecessary in this mode
• Kustomize configuration: Set up full kustomize overlays for CRDs, RBAC, manager, metrics, Prometheus monitoring, network policies, and scorecard
• CI pipelines: Add GitHub Actions workflows for linting (golangci-lint), unit tests, and e2e tests (using kind)
• Dev environment: Include a devcontainer configuration with post-install script for a ready-to-use development setup

[TeddyAndrieux]

LGTM but to me scaffolding has to be re-done to change the name from platform-disk-management-agent to disk-management-agent

nit: Also if you may mention the operator-sdk command that has been ran in the commit body could be cool :)

[vdaviot]

scaffolding has to be re-done to change the name from platform-disk-management-agent to disk-management-agent

I might change that at the end if that's ok for you @TeddyAndrieux, this way I don't have to chain merge/update in each PRs