backstage: Entity Registration cannot process branches with forward slash

Expected Behavior

When testing out registering a service in backstage, say on a feature branch feature/my-awesome-feature, the user should be able to register by passing https://github.com/MyOrg/my-service/blob/feature/my-awesome-feature/catalog-info.yaml to the entity registration form

Current Behavior

Instead, the user will get the following error

Unable to read url, NotFoundError: https://github.com/MyOrg/my-service/blob/feature/my-awesome-feature/catalog-info.yaml could not be read as https://api.github.com/repos/MyOrg/my-service/contents/backstage/catalog-info.yaml?ref=feature, 404 Not Found

my-awesome-feature looks as though it is being truncated from ?ref=...

Possible Solution

Haven’t looked into it, but presumably a simple fix of just not truncating, and perhaps URL encoding the /?

Steps to Reproduce

1. Create a branch with a / in the name
2. Attempt to register an entity on that branch in Backstage

Context

Honestly, not a blocker, since 99/100 you are either going to have the entity registered on a scaffolding event or are going to track the head branch, but for testing this can be a bit of a rough start for people trying to be onboarded to backstage.

Your Environment

• NodeJS Version (v12): 12
• Operating System and Version (e.g. Ubuntu 14.04): Mac (though deployed app is running ubuntu… 18?)
• Browser Information: Chrome