ci(release): let a re-run override the existing release

.forgejo/workflows/release.yml

@@ -64,6 +64,11 @@ jobs:
         uses: actions/forgejo-release@v2
         with:
           direction: upload
+          # A re-run finds the release it made last time and would otherwise die
+          # on `curl: (22) ... 409` when it tries to create it again.  Override
+          # deletes and recreates the release (the tag survives, since it still
+          # matches the triggered SHA), so re-running this workflow is safe.
+          override: true
           tag: ${{ forgejo.ref_name }}
           title: ${{ forgejo.ref_name }}
           release-notes-file: dist/notes.md