Form preview link sometimes breaks when the branch name cuts off on a dash

[Skaiir]

Describe the Bug

When linking a branch which is long enough and includes dashes (-), sometimes the playground link doesn't match the actual upload link.

Example for this PR: #999

Link in the PR points to:
https://demo-642-relax-text-component---camunda-form-playground.netlify.app/

But it's actually uploaded at:
https://demo-642-relax-text-component--camunda-form-playground.netlify.app/

There's an extra dash that snuck in there (or was lost).

Fun bug.

Steps to Reproduce

Haven't reproduced yet, lazy. But I assume this will break if you:

1. create a PR from a branch named after the pattern any 24 characters - anything
2. add deploy-preview on the PR
3. let it build
4. navigate to it
5. dead link
6. remove one of the dashes from the url
7. proper link

Expected Behavior

5. the link posted to github should be the proper one