on_skipped option doesn't work

[raeyulca]

What happened:
Supplying the on_skipped condition to a task's dependent task does not result in the task running, when the dependent task is skipped.
What you expected to happen:
I expect that the task to run when the dependent task is skipped.
How to reproduce it (as minimally and precisely as possible):
Here is a configuration file that reproduces the error; the third task should run, but it doesn't.

version: v0

runs:
  - name: show issue
    tasks:
      - name: successful task
        runtime:
          containers:
            - image: alpine
        steps:
          - run:
              name: echo
              command: echo hello

      - name: failure-dependent task
        depends:
          - successful task:
            - on_failure
        runtime:
          containers:
            - image: alpine
        steps:
          - run:
              name: echo
              command: echo "The previous task failed."

      - name: skip-dependent task
        depends:
          - failure-dependent task:
            - on_skipped
        runtime:
          containers:
            - image: alpine
        steps:
          - run:
              name: echo
              command: echo "The previous task was skipped."

Anything else we need to know?:
I was able to resolve this issue by modifying /internal/runconfig/runconfig.go

Before the fix:

After the fix:

Environment:

• Agola version: latest (0.6.0)
• Agola running environment (if useful to understand the bug): Docker
• Others: