Add a conditional attribute to force execution regardless of changes

[dmnelson]

Hi all!

I think it would be valuable to have an option to force the execution of the pipeline if a certain condition is met, possible use cases are the following:

• Always run the entire pipeline when build is triggered on main branch.
• Always trigger certain (or all) steps based on PR labels
  • That would be helpful for devs that want a full regression on their changes

I was thinking of a OR operator on this case. If it's matches the diff OR the additional conditions.

[xiangweilee]

+1