Per-volume ephemeral attribute in devfile

[mshaposhnik]

Is your task related to a problem? Please describe.

Che-plugins allow to set ephemeral mode for container volumes described in meta.yaml.
To share such a volume with some other component, it is need to be possible to set ephemeral in the target component volume definition as well, since the same volume cannot be bound in ephemeral and persistent mode at the same time.

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Describe alternatives you've considered

Additional context

#17102 (comment)
Expected devfile format:

devfile

apiVersion: 1.0.0
metadata:
  name: testJDKVersionKube
attributes:
  persistVolumes: 'true'
projects:
  - name: console-java-simple
    source:
      location: 'https://github.com/che-samples/console-java-simple.git'
      type: git
      branch: java1.11
components:
  - referenceContent: |
      apiVersion: v1
      kind: Pod
      metadata:
        name: ws
      spec:
        initContainers:
          - name: init-myservice
            image: adoptopenjdk/openjdk15-openj9
            command: ['sh', '-c', "echo copying jdk... && cp -R /opt/java/openjdk/ /tmp/jdk && echo done"]
    type: kubernetes
    volumes:
      - name: jdk
        containerPath: /tmp/jdk
        ephemeral: true
  - id: redhat/java11/latest
    preferences:
      java.configuration.runtimes: |-
        [
          {
            "name": "Open J9 15",
            "path": "/tmp/jdk/openjdk",
            "default": true
          }
        ]
    type: chePlugin
    volumes:
      - name: jdk
        containerPath: /tmp/jdk
  - mountSources: true
    memoryLimit: 512Mi
    type: dockerimage
    volumes:
      - name: jdk
        containerPath: /tmp/jdk
        ephemeral: true
      - name: m2
        containerPath: /home/user/.m2
    image: 'quay.io/eclipse/che-java11-maven:7.13.1'
    alias: maven
    env:
      - value: /tmp/jdk/openjdk
        name: JAVA_HOME
      - value: ''
        name: MAVEN_CONFIG
      - value: '-XX:MaxRAMPercentage=50 -XX:+UseParallelGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xms20m -Djava.security.egd=file:/dev/./urandom'
        name: JAVA_OPTS
      - value: '-XX:MaxRAMPercentage=50 -XX:+UseParallelGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xms20m -Djava.security.egd=file:/dev/./urandom -Duser.home=/home/user'
        name: MAVEN_OPTS
      - value: '-XX:MaxRAMPercentage=50 -XX:+UseParallelGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xms20m -Djava.security.egd=file:/dev/./urandom'
        name: JAVA_TOOL_OPTIONS
commands:
  - name: maven build
    actions:
      - workdir: '${CHE_PROJECTS_ROOT}/console-java-simple'
        type: exec
        command: mvn clean install
        component: maven
  - name: maven build and run
    actions:
      - workdir: '${CHE_PROJECTS_ROOT}/console-java-simple'
        type: exec
        command: mvn clean install && java -jar ./target/*.jar
        component: maven

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