gha - fix concurrency cancelling preview deployement on comments

Author: cderv

.github/workflows/preview.yml

@@ -8,8 +8,9 @@ name: Deploy Preview
 
 concurrency:
   # Use github.event.pull_request.number on pull requests, so it's unique per pull request
+  # Use github.event.issue.number on issue comments, so it's unique per comment
   # Use github.ref on other branches, so it's unique per branch
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.event.issue.number || github.ref }}
+  group: ${{ github.workflow }}-${{ (github.event.pull_request && format('PR-{0}', github.event.pull_request.number)) || ( github.event.issue && format('comment-{0}', github.event.issue.number) ) || github.ref }}
   cancel-in-progress: true
 
 jobs: