Fully compatibility for custom steps using GitLab instead GitHub

Description of the feature request

Currently, when a user develops a custom step using GitLab instead GitHub, the Workflow Editor is not able to retrieve the step.yml information and the web console does not allow the user to edit the inputs from the GUI. The only way to edit the input fields is through the bitrise.yml file, editing it directly.

It would be great if this also works with GitLab, as it is also really extended among the users.

Use case / for what or how I would use it

For custom steps developed using GitLab instead GitHub.

Thanks for the #feature-request @jgironda! Please don’t forget to vote for it!