Temporary: Run the builds across Rubies on this branch

The first run on GitHub runners, to check disk, timing and how steady a runner is. workflow_dispatch only works once the workflow is on main. This commit comes out before merge.

Author: JuanVqz

.github/workflows/benchmarks-cross-ruby.yml

@@ -7,6 +7,9 @@ on:
     # Sunday 03:00 UTC, away from the working day's PR runs.
     - cron: '0 3 * * 0'
   workflow_dispatch:
+  # Temporary: the first run on GitHub runners, from this PR's branch (workflow_dispatch only works once the file is on main). Removed before merge.
+  push:
+    branches: [feature/results-site-view-2]
 
 jobs:
   shard: