run_if gets removes from workflows defined in pipeline stages on save

[sandersaelmans]

e.g:

stages:
  some_stage:
    workflows:
    - some_work_flow:
        run_if: '{{getenv "i_feel_like_it" | ne ""}}' # <- will be removed on save

[gent-ahmeti]

I would like to +1 this and add documentation from Bitrise that says this is allowed

(Bonus) It would be nice not to overwrite the whole file everytime we save. Because multiple people change the config file, not all of them use the editor. So whenever I make minor changes there are usually too many changes to commit