Add Run Container to the reference implementation

[ricardozanini]

Depends on #222

Use the following example to run containers from the reference implementation:

document:
  dsl: '1.0.0-alpha5'
  namespace: test
  name: run-container
  version: '0.1.0'
do:
  - runContainer:
      run:
        container:
          image: hello-world

[github-actions]

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