Fix run-name to show commit hash instead of invalid split() function

Use github.sha to display the actual commit hash in workflow runs:
- Manual runs: "Manual Test - abc1234"
- Automatic runs: "Fast Build - def5678"

This fixes the workflow validation error and restores the friendly name
"Main Push - Fast" in the GitHub Actions workflow list.

Signed-off-by: Mark Pollack <mark.pollack@broadcom.com>

Author: markpollack

.github/workflows/main-push-fast.yml

@@ -1,5 +1,5 @@
 name: Main Push - Fast
-run-name: ${{ github.event.inputs.commit_sha && format('Manual Test - {0}', github.event.inputs.commit_sha) || format('Fast Build - {0}', split(github.event.head_commit.message, '\n')[0]) }}
+run-name: ${{ github.event.inputs.commit_sha && format('Manual Test - {0}', github.event.inputs.commit_sha) || format('Fast Build - {0}', github.sha) }}
 
 on:
   push: