feat: make the error value of a step available

[wI2L]

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• I'm submitting a ...

  • bug report
  • feature request

• Do you want to request a feature or report a bug?

Feature request/enhancement.

• What is the current behavior?

The error value of a step action is not accessible, and cannot be used in a check.

• What is the expected behavior?

Given the following step with conditions, I would like to be able to access to the error value so that it can be used with the REGEXP operator in a check.

    myStep:
        dependencies: [myDep]
        description : Loreum Ipsum
        action:
            type: toto
        conditions:
            - type: check
              if:
              - value: '{{.step.anotherStep.error}}'
                operator: regexp
                expected: '.*error message.*'
              then:
                this: DONE
              message: foobar

• Which version of uTask are you using?

Latest.