feat: show commit message in fast workflow run name

Display the commit message in the GitHub Actions UI run name to help
distinguish between multiple builds triggered in quick succession.

- Manual runs show: 'Manual Test - <commit_sha>'
- Push triggers show: 'Fast Build - <commit message>'

This makes it much easier to identify which commit each workflow run
corresponds to when viewing the Actions tab.

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('Fast Test - {0}', github.event.inputs.commit_sha) || 'Main Push - Fast' }}
+run-name: ${{ github.event.inputs.commit_sha && format('Manual Test - {0}', github.event.inputs.commit_sha) || format('Fast Build - {0}', github.event.head_commit.message) }}
 
 on:
   push: