We're deploying a service from a GitHub workflow (on new PR) and want to connect the new service to the PR branch. Deployment and everything works, but the new service gets attached to develop branch from which it was copied.

Is there any way to switch the branch post deployment or at any point?

Currently we're doing:

railway link --project ${{ env.RAILWAY_PROJECT_NAME }} --environment develop 
railway environment new ${{ github.head_ref }} --copy develop

and then

railway link --project ${{ env.RAILWAY_PROJECT_NAME }} --environment ${{ github.head_ref }}
          railway up --detach --service ${{ env.RAILWAY_BACKEND_SERVICE_NAME }}

github.head_ref will resolve to the PR branch name.