kubevela/docs/examples/registry/initcontainer.yaml

apiVersion: core.oam.dev/v1alpha2
kind: TraitDefinition
metadata:
  annotations:
    definition.oam.dev/description: "add an init container and use shared volume with pod"
  name: init-container
spec:
  appliesToWorkloads:
    - webservice
    - worker
  extension:
    template: |-
      patch: {
      	spec: template: spec: {
      		// +patchKey=name
      		containers: [{
      			name: context.name
      			// +patchKey=name
      			volumeMounts: [{
      				name:      parameter.mountName
      				mountPath: parameter.appMountPath
      			}]
      		}]
      		initContainers: [{
      			name:    parameter.name
      			image:   parameter.image
      			command: parameter.command
      			// +patchKey=name
      			volumeMounts: [{
      				name:      parameter.mountName
      				mountPath: parameter.initMountPath
      			}]
      		}]
      		// +patchKey=name
      		volumes: [{
      			name:     parameter.mountName
      			emptyDir: {}
      		}]
      	}
      }

      parameter: {
      	name:  string
      	image: string
      	command?: [...string]
      	mountName:     *"workdir" | string
      	appMountPath:  string
      	initMountPath: string
      }