ci: group foundationdb release dispatch runs by release tag

A manual run now shares the tag-push concurrency group for the same
release, so a re-publish of a tag queues behind (or ahead of) the push
run instead of racing it on the same image tag.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.github/workflows/container_release_foundationdb.yml

@@ -12,7 +12,7 @@ on:
         default: ''
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || (github.event_name == 'push' && github.ref) || github.event.inputs.release_tag || github.run_id }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || (github.event_name == 'push' && github.ref) || format('refs/tags/{0}', github.event.inputs.release_tag) || github.run_id }}
   cancel-in-progress: ${{ github.event_name == 'pull_request' || (github.event_name == 'push' && !startsWith(github.ref, 'refs/tags/')) }}
 
 permissions: