Allow volumes to be shared across components about api HOT 7 CLOSED

cc @johnmcollier @elsony

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@johnmcollier will provide another example using a component of type Kubernetes

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Does it duplicate #16 ?

There is another interesting option to think about - add an ability to specify PVC name for volume eclipse-che/che#15652

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@sleshchenko Yeah it's the same, since there's already some discussion here, I'll close out my issue in favour of this one.

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Sample with Kubernetes component:

---
projects:
  - name: "my-project"
components:
  - container:
      image: "busybox"
      name: "mycontainer"
      memoryLimit: "128M"
      mountSources: true
      volumeMount:
        - name: my-data-volume
          path: /some/folder
  - kubernetes:
      referenceContent: |
        kind: Pod
        metadata:
          name: sample-pod
        spec:
          containers:
            image: docker.io/my-sample-image:latest
            volumeMounts:
            - mountPath: /some/path
              name: my-data-volume
  - volume:
     name: my-data-volume
     size: 5Gi

In this scenario, the Kubernetes component references the my-data-volume defined in the volume section under components, rather than having to define one via a persistent volume claim in the pod spec.

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Reviewed and approved the version provided on this comment.
We also agreed that the name field should be mandatory for volume components.

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implemented

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